xfs: fix uninitialized return values in scrub code

Fix smatch complaints about uninitialized return codes.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

fs/xfs/scrub/dir.c

@@ -748,7 +748,7 @@ xfs_scrub_directory(
 	};
 	size_t				bufsize;
 	loff_t				oldpos;
-	int				error;
+	int				error = 0;
 
 	if (!S_ISDIR(VFS_I(sc->ip)->i_mode))
 		return -ENOENT;