[S390] Replace ENOTSUPP usage with EOPNOTSUPP

ENOTSUPP is not supposed to leak to userspace so lets just use
EOPNOTSUPP everywhere.
Doesn't fix a bug, but makes future reviews easier.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index ae9c564..998bde3 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1592,7 +1592,7 @@
 static int vmcmd_init(void)
 {
 	if (!MACHINE_IS_VM)
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 	vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
 	if (!vmcmd_kset)
 		return -ENOMEM;