[XFS] silence gcc4 warnings. the directory ones are wrong because of

information gcc could not find out (that a directory always has a ..
entry), the others are outright gcc bugs.

SGI-PV: 943511
SGI-Modid: xfs-linux:xfs-kern:200055a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/xfs_acl.c

@@ -436,6 +436,7 @@ xfs_acl_access(
 	int		seen_userobj = 0;
 
 	matched.ae_tag = 0;	/* Invalid type */
+	matched.ae_perm = 0;
 	md >>= 6;	/* Normalize the bits for comparison */
 
 	for (i = 0; i < fap->acl_cnt; i++) {