blk-mq: Unexport blk_mq_flush_busy_ctxs()

Commit a608884 ("block: kyber: make kyber more friendly with merging")
removed the only blk_mq_flush_busy_ctxs() call from outside the block layer
core. Hence unexport blk_mq_flush_busy_ctxs().

Signed-off-by: Bart Van Assche <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: bvanassche

block/blk-mq.c

@@ -1726,7 +1726,6 @@ void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
 
 	sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data);
 }
-EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs);
 
 struct dispatch_rq_data {
 	struct blk_mq_hw_ctx *hctx;