blk-mq-tag: remove redundant check for 'data->hctx' being non-NULL

We used to pass in NULL for hctx for reserved tags, but we don't
do that anymore. Hence the check for whether hctx is NULL or not
is now redundant, kill it.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Fixes: a642a158aec6 ("blk-mq-tag: cleanup the normal/reserved tag allocation")
Signed-off-by: NJens Axboe <axboe@fb.com>

block/blk-mq-tag.c

@@ -136,11 +136,9 @@ unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
 		/*
 		 * We're out of tags on this hardware queue, kick any
 		 * pending IO submits before going to sleep waiting for
-		 * some to complete. Note that hctx can be NULL here for
-		 * reserved tag allocation.
+		 * some to complete.
 		 */
-		if (data->hctx)
-			blk_mq_run_hw_queue(data->hctx, false);
+		blk_mq_run_hw_queue(data->hctx, false);
 
 		/*
 		 * Retry tag allocation after running the hardware queue,