KVM: s390: coding style kvm_s390_gisa_init/clear()

The change helps to reduce line length and
increases code readability.
Signed-off-by: Michael Mueller <mimu@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <20190131085247.13826-5-mimu@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/kvm/interrupt.c

@@ -2885,20 +2885,20 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
 
 void kvm_s390_gisa_clear(struct kvm *kvm)
 {
-	if (kvm->arch.gisa) {
+	if (!kvm->arch.gisa)
+		return;
 	memset(kvm->arch.gisa, 0, sizeof(struct kvm_s390_gisa));
 	kvm->arch.gisa->next_alert = (u32)(u64)kvm->arch.gisa;
 	VM_EVENT(kvm, 3, "gisa 0x%pK cleared", kvm->arch.gisa);
-	}
 }
 
 void kvm_s390_gisa_init(struct kvm *kvm)
 {
-	if (css_general_characteristics.aiv) {
+	if (!css_general_characteristics.aiv)
+		return;
 	kvm->arch.gisa = &kvm->arch.sie_page2->gisa;
-		VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
 	kvm_s390_gisa_clear(kvm);
-	}
+	VM_EVENT(kvm, 3, "gisa 0x%pK initialized", kvm->arch.gisa);
 }
 
 void kvm_s390_gisa_destroy(struct kvm *kvm)