s390/cio: Remove unused inline function idset_sch_get_first

commit 8ebd51a705c5 ("s390/cio: idset.c: remove some unused functions")
left behind this, remove it

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: YueHaibing <[e-mail]>
Reviewed-by: Vineeth Vijayan <[e-mail]>
[[e-mail]: Slight modification in the title]
Signed-off-by: Vineeth Vijayan <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

drivers/s390/cio/idset.c

···
 	return test_bit(ssid * set->num_id + id, set->bitmap);
 }
 
-static inline int idset_get_first(struct idset *set, int *ssid, int *id)
-{
-	int bitnum;
-
-	bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id);
-	if (bitnum >= set->num_ssid * set->num_id)
-		return 0;
-	*ssid = bitnum / set->num_id;
-	*id = bitnum % set->num_id;
-	return 1;
-}
-
 struct idset *idset_sch_new(void)
 {
 	return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1);