s390/cio: remove invalid condition on IO_SCH_UNREG

The condition to check the cdev pointer validity on
css_sch_device_unregister() is a leftover from the 'commit 8cc0dcf
("s390/cio: remove pm support from ccw bus driver")'. This could lead to a
situation, where detaching the device is not happening completely. Remove
this invalid condition in the IO_SCH_UNREG case.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 8cc0dcf ("s390/cio: remove pm support from ccw bus driver")
Reported-by: Christian Ehrhardt <[email protected]>
Suggested-by: Christian Ehrhardt <[email protected]>
Cc: <[email protected]>
Signed-off-by: Vineeth Vijayan <[email protected]>
Tested-by: Julian Wiedmann <[email protected]>
Reviewed-by: Peter Oberparleiter <[email protected]>
Tested-by: Christian Ehrhardt <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

Author: vneethv

drivers/s390/cio/device.c

@@ -1532,8 +1532,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
 	switch (action) {
 	case IO_SCH_ORPH_UNREG:
 	case IO_SCH_UNREG:
-		if (!cdev)
-			css_sch_device_unregister(sch);
+		css_sch_device_unregister(sch);
 		break;
 	case IO_SCH_ORPH_ATTACH:
 	case IO_SCH_UNREG_ATTACH: