[XFS] Rework code snippets slightly to remove remaining recent-gcc
warnings.

SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26364a

Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 55b4237..3cb678e 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -990,6 +990,8 @@
 	xfs_daddr_t     num_scan_bblks;
 	int	        error, log_bbnum = log->l_logBBsize;
 
+	*blk_no = 0;
+
 	/* check totally zeroed log */
 	bp = xlog_get_bp(log, 1);
 	if (!bp)