valgrind/i386: avoid false positives on KVM_SET_VCPU_EVENTS ioctl

struct kvm_vcpu_events contains reserved fields. Let's use a
designated initializer to avoid false positives in valgrind.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target-i386/kvm.c

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 1762c2e..4a2ee6f 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1884,7 +1884,7 @@
 static int kvm_put_vcpu_events(X86CPU *cpu, int level)
 {
     CPUX86State *env = &cpu->env;
-    struct kvm_vcpu_events events;
+    struct kvm_vcpu_events events = {};
 
     if (!kvm_has_vcpu_events()) {
         return 0;