block/blk-tag.c: Remove useless kfree

Remove useless kfree() and clean up code related to the removal.

The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
position p1,p2;
expression x;
@@

if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }

@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@

if (x@p1 == NULL) { ... when != I(x,...) S
when != e = e1
when != e += e1
when != e -= e1
when != ++e
when != --e
when != e++
when != e--
when != &e
kfree@p2(x); ... return ...; }

@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@

... when != true x@p1 == NULL
kfree@p2(x);

@depends on !ok && unchanged@
position r.p2;
expression x;
@@

*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

block/blk-tag.c

···
 		tags = __blk_queue_init_tags(q, depth);
 
 		if (!tags)
-			goto fail;
+			return -ENOMEM;
+
 	} else if (q->queue_tags) {
 		rc = blk_queue_resize_tags(q, depth);
 		if (rc)
···
 	queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, q);
 	INIT_LIST_HEAD(&q->tag_busy_list);
 	return 0;
-fail:
-	kfree(tags);
-	return -ENOMEM;
 }
 EXPORT_SYMBOL(blk_queue_init_tags);