KVM: Remove ptr comparisons to 0

Fix sparse warnings "Using plain integer as NULL pointer"
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm.h

@@ -398,7 +398,7 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 
 static inline int irqchip_in_kernel(struct kvm *kvm)
 {
-	return pic_irqchip(kvm) != 0;
+	return pic_irqchip(kvm) != NULL;
 }
 
 struct descriptor_table {

drivers/kvm/kvm_main.c

@@ -1449,7 +1449,8 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
 
 	/* A kmem cache lets us meet the alignment requirements of fx_save. */
 	kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
-					   __alignof__(struct kvm_vcpu), 0, 0);
+					   __alignof__(struct kvm_vcpu),
+					   0, NULL);
 	if (!kvm_vcpu_cache) {
 		r = -ENOMEM;
 		goto out_free_4;

drivers/kvm/svm.c

@@ -1271,7 +1271,7 @@ static int handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 		       exit_code);
 
 	if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
-	    || svm_exit_handlers[exit_code] == 0) {
+	    || !svm_exit_handlers[exit_code]) {
 		kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
 		kvm_run->hw.hardware_exit_reason = exit_code;
 		return 0;