valgrind: avoid false positives on KVM_GET_MSRS ioctl

struct kvm_msrs contains a pad field. Lets initialize this pad
field. A designated initializer seems not appropriate here, as
struct kvm_msrs is embedded in the msr_data structure.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
valgrind: 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>