Fixed xfs_lowbit, try 3

[Andi Kleen <ak@xxxxxxxxxxxxx>]

This xfs_lowbit version should work for everybody now including 
generic_ffs

(except parisc apparently which has a totally broken ffs)

-Andi

--- linux-2.6.0test3/fs/xfs/xfs_bit.c-o 2003-05-27 03:00:41.000000000 +0200
+++ linux-2.6.0test/fs/xfs/xfs_bit.c    2003-08-23 00:15:38.000000000 +0200
@@ -156,12 +156,12 @@
 {
        int n;
        n = ffs((unsigned)v);
-       if (n == 0) {
+       if (n <= 0) {
                n = ffs(v >> 32);
                if (n >= 0)
                        n+=32;
        }
-       return n-1;
+       return (n <= 0) ? n : n-1;
 }
 
 /*