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block/blk-throttle: silence !BLK_DEV_IO_TRACE variable warnings

If blk-throttle is enabled but blktrace is not, then the compiler will
notice that the following two variables are unused:

../block/blk-throttle.c: In function 'throtl_pending_timer_fn':
../block/blk-throttle.c:1153:30: warning: unused variable 'bio_cnt_w' [-Wunused-variable]
1153 | unsigned int bio_cnt_w = sq_queued(sq, WRITE);
| ^~~~~~~~~
../block/blk-throttle.c:1152:30: warning: unused variable 'bio_cnt_r' [-Wunused-variable]
1152 | unsigned int bio_cnt_r = sq_queued(sq, READ);
| ^~~~~~~~~

Silence that my annotating them with __maybe_unused.

Fixes: 28ad83b774a6 ("blk-throttle: Split the service queue")
Link: https://lore.kernel.org/all/20250515130830.9671-1-aishwarya.tcv@arm.com/
Reported-by: Aishwarya <aishwarya.tcv@arm.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Jens Axboe dbc5ba08 bbcacab2

+2 -2
+2 -2
block/blk-throttle.c
··· 1149 1149 dispatched = false; 1150 1150 1151 1151 while (true) { 1152 - unsigned int bio_cnt_r = sq_queued(sq, READ); 1153 - unsigned int bio_cnt_w = sq_queued(sq, WRITE); 1152 + unsigned int __maybe_unused bio_cnt_r = sq_queued(sq, READ); 1153 + unsigned int __maybe_unused bio_cnt_w = sq_queued(sq, WRITE); 1154 1154 1155 1155 throtl_log(sq, "dispatch nr_queued=%u read=%u write=%u", 1156 1156 bio_cnt_r + bio_cnt_w, bio_cnt_r, bio_cnt_w);