make iunique use a do/while loop rather than its obscure goto loop

A while back, Christoph mentioned that he thought that iunique ought to be
cleaned up to use a more conventional loop construct. This patch does that,
turning the strange goto loop into a do/while.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/inode.c

@@ -685,25 +685,21 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
 {
 	static ino_t counter;
 	struct inode *inode;
-	struct hlist_head * head;
+	struct hlist_head *head;
 	ino_t res;
+
 	spin_lock(&inode_lock);
-retry:
-	if (counter > max_reserved) {
-		head = inode_hashtable + hash(sb,counter);
+	do {
+		if (counter <= max_reserved)
+			counter = max_reserved + 1;
 		res = counter++;
+		head = inode_hashtable + hash(sb, res);
 		inode = find_inode_fast(sb, head, res);
-		if (!inode) {
+	} while (inode != NULL);
 	spin_unlock(&inode_lock);
-			return res;
-		}
-	} else {
-		counter = max_reserved + 1;
-	}
-	goto retry;
 
+	return res;
 }
-
 EXPORT_SYMBOL(iunique);
 
 struct inode *igrab(struct inode *inode)