[PATCH] xfsprogs: fix unint var in repair phase6

[Eric Sandeen <sandeen@xxxxxxxxxx>]

2 calls to libxfs_bmapi_write exist in repair's phase6
where "first" is uninitialized, but is accessed
in that function.

Normally we call xfs_bmap_init() first to initialize
both the free list and the first block, but in these
cases, the free list var is sent as NULL.

So in these 2 cases, explicitly initialize the "first"
variable to NULLFSBLOCK as xfs_bmap_init() does
elsewhere.

Coverity caught this.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

diff --git a/repair/phase6.c b/repair/phase6.c
index 5c33797..119ec3b 100644
--- a/repair/phase6.c
+++ b/repair/phase6.c
@@ -536,6 +536,7 @@ fill_rbmino(xfs_mount_t *mp)
                        error);
        }
 
+       first = NULLFSBLOCK;
        while (bno < mp->m_sb.sb_rbmblocks)  {
                /*
                 * fill the file one block at a time
@@ -605,6 +606,7 @@ fill_rsumino(xfs_mount_t *mp)
                        error);
        }
 
+       first = NULLFSBLOCK;
        while (bno < end_bno)  {
                /*
                 * fill the file one block at a time