s390x/sclp: Fixed setting of condition code register

In the SCLP handler function, the condition code register must
only be set if no exception occured.
Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>

target-s390x/kvm.c

@@ -451,8 +451,9 @@ static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
     r = sclp_service_call(env, sccb, code);
     if (r < 0) {
         enter_pgmcheck(cpu, -r);
+    } else {
+        setcc(cpu, r);
     }
-    setcc(cpu, r);
 
     return 0;
 }