drivers/memstick/host/rtsx_pci_ms.c: add cancel_work when remove driver

Add cancel_work_sync() in rtsx_pci_ms_drv_remove() to cancel pending
request work when removing the driver.

Signed-off-by: Micky Ching <[e-mail]>
Cc: Samuel Ortiz <[e-mail]> says:
Cc: Maxim Levitsky <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Alex Dubov <[e-mail]>
Cc: Roger Tseng <[e-mail]>
Cc: Wei WANG <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/memstick/host/rtsx_pci_ms.c

···
 	pcr->slots[RTSX_MS_CARD].card_event = NULL;
 	msh = host->msh;
 	host->eject = true;
+	cancel_work_sync(&host->handle_req);
 
 	mutex_lock(&host->host_mutex);
 	if (host->req) {