GFS2: gfs2_dir_get_hash_table(): avoiding deferred vfree() is easy here...

vfree() is allowed under spinlock these days, but it's cheaper when
it doesn't step into deferred case and here it's very easy to avoid.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

fs/gfs2/dir.c

@@ -370,11 +370,12 @@ static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
 	}
 
 	spin_lock(&inode->i_lock);
-	if (ip->i_hash_cache)
-		kvfree(hc);
-	else
+	if (likely(!ip->i_hash_cache)) {
 		ip->i_hash_cache = hc;
+		hc = NULL;
+	}
 	spin_unlock(&inode->i_lock);
+	kvfree(hc);
 
 	return ip->i_hash_cache;
 }