floppy: remove duplicated code in redo_fd_request()

duplicated code in redo_fd_request(),
unlock_fdc() function has the same code "do_floppy = NULL" inside.

Signed-off-by: Yufeng Wang <wangyufeng@kylinos.cn>
Suggested-by: Denis Efremov <efremov@linux.com>
Link: https://lore.kernel.org/r/20240319014219.7812-1-wangyufeng@kylinos.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 1b399ec..25c9d85 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2787,7 +2787,6 @@
 		pending = set_next_request();
 		spin_unlock_irq(&floppy_lock);
 		if (!pending) {
-			do_floppy = NULL;
 			unlock_fdc();
 			return;
 		}