block: mark blk_account_io_completion static

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-core.c

@@ -1381,7 +1381,7 @@ unsigned int blk_rq_err_bytes(const struct request *rq)
 }
 EXPORT_SYMBOL_GPL(blk_rq_err_bytes);
 
-void blk_account_io_completion(struct request *req, unsigned int bytes)
+static void blk_account_io_completion(struct request *req, unsigned int bytes)
 {
 	if (req->part && blk_do_io_stat(req)) {
 		const int sgrp = op_stat_group(req_op(req));

block/blk.h

@@ -187,7 +187,6 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
 		unsigned int nr_segs, struct request **same_queue_rq);
 
 void blk_account_io_start(struct request *req, bool new_io);
-void blk_account_io_completion(struct request *req, unsigned int bytes);
 void blk_account_io_done(struct request *req, u64 now);
 
 /*