block/floppy: Fix a sparse warning

Since the type of request.cmd_flags has been changed from u32 into
blk_opf_t, use the __force keyword when casting to an integer type to
prevent that sparse warns about this cast.

Cc: Denis Efremov <efremov@linux.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220714180729.1065367-16-bvanassche@acm.org


Signed-off-by: Jens Axboe <axboe@kernel.dk>