GFS2: return -E2BIG if hit the maximum limits of ACLs

Return -E2BIG rather than -EINVAL if hit the maximum size limits of
ACLs, as the former errno is consistent with VFS xattr syscalls.

This is pointed out by Dave Chinner in previous discussion thread:
http://www.spinics.net/lists/linux-fsdevel/msg71125.htmlSigned-off-by: NJie Liu <jeff.liu@oracle.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

fs/gfs2/acl.c

@@ -86,7 +86,7 @@ int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	BUG_ON(name == NULL);
 
 	if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
-		return -EINVAL;
+		return -E2BIG;
 
 	if (type == ACL_TYPE_ACCESS) {
 		umode_t mode = inode->i_mode;