floppy: remove set but not used variable 'q'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/block/floppy.c: In function 'request_done':
drivers/block/floppy.c:2233:24: warning:
 variable 'q' set but not used [-Wunused-but-set-variable]

It's never used and can be removed.
Acked-by: NJiri Kosina <jkosina@suse.cz>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/block/floppy.c

@@ -2230,7 +2230,6 @@ static void floppy_end_request(struct request *req, blk_status_t error)
 static void request_done(int uptodate)
 {
 	struct request *req = current_req;
-	struct request_queue *q;
 	int block;
 	char msg[sizeof("request done ") + sizeof(int) * 3];
 
@@ -2243,8 +2242,6 @@ static void request_done(int uptodate)
 		return;
 	}
 
-	q = req->q;
-
 	if (uptodate) {
 		/* maintain values for invalidation on geometry
 		 * change */