block: Remove unused blk_mq_sched_free_hctx_data()

Now we usually free the hctx->sched_data by e->type->ops.exit_hctx(),
and no users will use blk_mq_sched_free_hctx_data() function.
Remove it.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq-sched.c

@@ -18,21 +18,6 @@
 #include "blk-mq-tag.h"
 #include "blk-wbt.h"
 
-void blk_mq_sched_free_hctx_data(struct request_queue *q,
-				 void (*exit)(struct blk_mq_hw_ctx *))
-{
-	struct blk_mq_hw_ctx *hctx;
-	int i;
-
-	queue_for_each_hw_ctx(q, hctx, i) {
-		if (exit && hctx->sched_data)
-			exit(hctx);
-		kfree(hctx->sched_data);
-		hctx->sched_data = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data);
-
 void blk_mq_sched_assign_ioc(struct request *rq)
 {
 	struct request_queue *q = rq->q;

block/blk-mq-sched.h

@@ -5,9 +5,6 @@
 #include "blk-mq.h"
 #include "blk-mq-tag.h"
 
-void blk_mq_sched_free_hctx_data(struct request_queue *q,
-				 void (*exit)(struct blk_mq_hw_ctx *));
-
 void blk_mq_sched_assign_ioc(struct request *rq);
 
 void blk_mq_sched_request_inserted(struct request *rq);