[PATCH] fix sparse pointer vs 0 warnings

[Christoph Hellwig <hch@xxxxxx>]

Sparse now warns about comparing pointers to 0, so change all instance
where that happens to NULL instead.


Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: linux-2.6-xfs/fs/xfs/xfs_log.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_log.c 2007-07-14 15:56:39.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfs_log.c      2007-07-14 15:58:16.000000000 +0200
@@ -2198,13 +2198,13 @@ xlog_state_do_callback(
                        }
                        cb = iclog->ic_callback;
 
-                       while (cb != 0) {
+                       while (cb) {
                                iclog->ic_callback_tail = &(iclog->ic_callback);
                                iclog->ic_callback = NULL;
                                LOG_UNLOCK(log, s);
 
                                /* perform callbacks in the order given */
-                               for (; cb != 0; cb = cb_next) {
+                               for (; cb; cb = cb_next) {
                                        cb_next = cb->cb_next;
                                        cb->cb_func(cb->cb_arg, aborted);
                                }
@@ -2215,7 +2215,7 @@ xlog_state_do_callback(
                        loopdidcallbacks++;
                        funcdidcallbacks++;
 
-                       ASSERT(iclog->ic_callback == 0);
+                       ASSERT(iclog->ic_callback == NULL);
                        if (!(iclog->ic_state & XLOG_STATE_IOERROR))
                                iclog->ic_state = XLOG_STATE_DIRTY;
 
@@ -3255,10 +3255,10 @@ xlog_ticket_put(xlog_t          *log,
 #else
        /* When we debug, it is easier if tickets are cycled */
        ticket->t_next     = NULL;
-       if (log->l_tail != 0) {
+       if (log->l_tail) {
                log->l_tail->t_next = ticket;
        } else {
-               ASSERT(log->l_freelist == 0);
+               ASSERT(log->l_freelist == NULL);
                log->l_freelist = ticket;
        }
        log->l_tail         = ticket;
@@ -3476,7 +3476,7 @@ xlog_verify_iclog(xlog_t   *log,
        s = LOG_LOCK(log);
        icptr = log->l_iclog;
        for (i=0; i < log->l_iclog_bufs; i++) {
-               if (icptr == 0)
+               if (icptr == NULL)
                        xlog_panic("xlog_verify_iclog: invalid ptr");
                icptr = icptr->ic_next;
        }
Index: linux-2.6-xfs/fs/xfs/xfs_log_recover.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_log_recover.c 2007-07-14 15:58:18.000000000 
+0200
+++ linux-2.6-xfs/fs/xfs/xfs_log_recover.c      2007-07-14 15:59:35.000000000 
+0200
@@ -1366,7 +1366,7 @@ xlog_recover_add_to_cont_trans(
        int                     old_len;
 
        item = trans->r_itemq;
-       if (item == 0) {
+       if (item == NULL) {
                /* finish copying rest of trans header */
                xlog_recover_add_item(&trans->r_itemq);
                ptr = (xfs_caddr_t) &trans->r_theader +
@@ -1412,7 +1412,7 @@ xlog_recover_add_to_trans(
        if (!len)
                return 0;
        item = trans->r_itemq;
-       if (item == 0) {
+       if (item == NULL) {
                ASSERT(*(uint *)dp == XFS_TRANS_HEADER_MAGIC);
                if (len == sizeof(xfs_trans_header_t))
                        xlog_recover_add_item(&trans->r_itemq);
@@ -1467,12 +1467,12 @@ xlog_recover_unlink_tid(
        xlog_recover_t          *tp;
        int                     found = 0;
 
-       ASSERT(trans != 0);
+       ASSERT(trans != NULL);
        if (trans == *q) {
                *q = (*q)->r_next;
        } else {
                tp = *q;
-               while (tp != 0) {
+               while (tp) {
                        if (tp->r_next == trans) {
                                found = 1;
                                break;
@@ -1495,7 +1495,7 @@ xlog_recover_insert_item_backq(
        xlog_recover_item_t     **q,
        xlog_recover_item_t     *item)
 {
-       if (*q == 0) {
+       if (*q == NULL) {
                item->ri_prev = item->ri_next = item;
                *q = item;
        } else {
@@ -1899,7 +1899,7 @@ xlog_recover_do_reg_buffer(
                        break;
                nbits = xfs_contig_bits(data_map, map_size, bit);
                ASSERT(nbits > 0);
-               ASSERT(item->ri_buf[i].i_addr != 0);
+               ASSERT(item->ri_buf[i].i_addr != NULL);
                ASSERT(item->ri_buf[i].i_len % XFS_BLI_CHUNK == 0);
                ASSERT(XFS_BUF_COUNT(bp) >=
                       ((uint)bit << XFS_BLI_SHIFT)+(nbits<<XFS_BLI_SHIFT));