[XFS] Sort out cosmetic differences between user and kernel copies of some
sources.

SGI-PV: 907752
SGI-Modid: xfs-linux-melb:xfs-kern:24659a

Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 5ecf3e3..d72c83d 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -608,6 +608,7 @@
 	count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
 	while (count_fsb > 0) {
 		imaps = nimaps;
+		firstblock = NULLFSBLOCK;
 		error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
 				  0, &firstblock, 0, imap, &imaps, NULL);
 		if (error)