block: ublk_drv: Remove unused function

The function are defined in the ublk_drv.c file, but not called
elsewhere, so delete the unused function.

drivers/block/ublk_drv.c:1211:20: warning: unused function 'ublk_abort_io_cmds'.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6938


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Fixes: b4e1353f ("ublk: simplify aborting request")
Reviewed-by: Ming Lei <ming.lei@rehdat.com>
Link: https://lore.kernel.org/r/20231019030444.53680-1-jiapeng.chong@linux.alibaba.com


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