s390/css: unneeded initialization in for_each_subchannel

The ret variable is always set by the fn function.
There is no need to initialize it.

Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-By: Sascha Silbe <silbe@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/css.c

@@ -44,7 +44,6 @@ for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
 	int ret;
 
 	init_subchannel_id(&schid);
-	ret = -ENODEV;
 	do {
 		do {
 			ret = fn(schid, data);