pktcdvd: Drop redundant castings for sector_t

Since the commit 72deb455 ("block: remove CONFIG_LBDAF")
the sector_t is always 64-bit type, no need to cast anymore.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20230310164549.22133-6-andriy.shevchenko@linux.intel.com


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