Initialize waiting_for_message field of struct vcpu.

Bug: 131434148
Change-Id: I28364bd8463f6b16980d865c305e35122af9a8d5
diff --git a/driver/linux b/driver/linux
index 9470423..ece5ef4 160000
--- a/driver/linux
+++ b/driver/linux
@@ -1 +1 @@
-Subproject commit 9470423471ad43b3aa2e5d43e4bd37f1c53e8e6e
+Subproject commit ece5ef4a217938841e3157d258212c6d29e3a326