remove pending exception on vcpu reset.

Without this qemu can even start on kvm modules with events support
since default value of exception_injected in zero and this is #DE
exception.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit e73223a584)

target-i386/kvm.c

@@ -227,6 +227,7 @@ int kvm_arch_init_vcpu(CPUState *env)
 
 void kvm_arch_reset_vcpu(CPUState *env)
 {
+    env->exception_injected = -1;
     env->interrupt_injected = -1;
     env->nmi_injected = 0;
     env->nmi_pending = 0;