s390/cio: de-duplicate subchannel validation

cio_validate_io_subchannel() and cio_validate_msg_subchannel() are
identical, as the called functions already take care about the
differences between subchannel types.

Just inline the code into the only user,
cio_validate_subchannel(), instead.

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/cio.c

@@ -476,26 +476,6 @@ static int cio_check_devno_blacklisted(struct subchannel *sch)
 	return 0;
 }
 
-static int cio_validate_io_subchannel(struct subchannel *sch)
-{
-	/* Initialization for io subchannels. */
-	if (!css_sch_is_valid(&sch->schib))
-		return -ENODEV;
-
-	/* Devno is valid. */
-	return cio_check_devno_blacklisted(sch);
-}
-
-static int cio_validate_msg_subchannel(struct subchannel *sch)
-{
-	/* Initialization for message subchannels. */
-	if (!css_sch_is_valid(&sch->schib))
-		return -ENODEV;
-
-	/* Devno is valid. */
-	return cio_check_devno_blacklisted(sch);
-}
-
 /**
  * cio_validate_subchannel - basic validation of subchannel
  * @sch: subchannel structure to be filled out
@@ -533,10 +513,11 @@ int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
 
 	switch (sch->st) {
 	case SUBCHANNEL_TYPE_IO:
-		err = cio_validate_io_subchannel(sch);
-		break;
 	case SUBCHANNEL_TYPE_MSG:
-		err = cio_validate_msg_subchannel(sch);
+		if (!css_sch_is_valid(&sch->schib))
+			err = -ENODEV;
+		else
+			err = cio_check_devno_blacklisted(sch);
 		break;
 	default:
 		err = 0;