Initialize waiting_for_message field of struct vcpu.

Bug: 131434148
Change-Id: Iec47a1fb1e027f9062ea0c948f36702e46be30cd
diff --git a/main.c b/main.c
index 6d306fe..3ef6bad 100644
--- a/main.c
+++ b/main.c
@@ -1069,6 +1069,7 @@
 			vcpu->vm = vm;
 			vcpu->vcpu_index = j;
 			atomic_set(&vcpu->abort_sleep, 0);
+			atomic_set(&vcpu->waiting_for_message, 0);
 		}
 	}