blk-stat: move BLK_RQ_STAT_BATCH definition to blk-stat.c

This is an implementation detail that no-one outside of blk-stat.c uses.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

block/blk-stat.c

@@ -9,6 +9,8 @@
 #include "blk-stat.h"
 #include "blk-mq.h"
 
+#define BLK_RQ_STAT_BATCH	64
+
 static void blk_stat_flush_batch(struct blk_rq_stat *stat)
 {
 	const s32 nr_batch = READ_ONCE(stat->nr_batch);

include/linux/blk_types.h

@@ -287,8 +287,6 @@ struct blk_issue_stat {
 	u64 time;
 };
 
-#define BLK_RQ_STAT_BATCH	64
-
 struct blk_rq_stat {
 	s64 mean;
 	u64 min;