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.html

Signed-off-by: Jie Liu <[e-mail]>
Signed-off-by: Steven Whitehouse <[e-mail]>

fs/gfs2/acl.c

···
 	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;