kvm: fix traces to use %x instead of %d

KVM request types are normally defined using hex constants but QEMU traces
print decimal values instead, which is not very convenient.

This changes the request type format from %d to %x.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

trace-events

@@ -1167,9 +1167,9 @@ virtio_ccw_new_device(int cssid, int ssid, int schid, int devno, const char *dev
 migrate_set_state(int new_state) "new state %d"
 
 # kvm-all.c
-kvm_ioctl(int type, void *arg) "type %d, arg %p"
-kvm_vm_ioctl(int type, void *arg) "type %d, arg %p"
-kvm_vcpu_ioctl(int cpu_index, int type, void *arg) "cpu_index %d, type %d, arg %p"
+kvm_ioctl(int type, void *arg) "type 0x%x, arg %p"
+kvm_vm_ioctl(int type, void *arg) "type 0x%x, arg %p"
+kvm_vcpu_ioctl(int cpu_index, int type, void *arg) "cpu_index %d, type 0x%x, arg %p"
 kvm_run_exit(int cpu_index, uint32_t reason) "cpu_index %d, reason %d"
 
 # memory.c