Bluetooth HCI Hal: Initialize has_died_

Bug: 205758693
Test: kill Bluetooth
Change-Id: Ia0c844a454524f9cf945c9622fa795dfda12ad3a
diff --git a/bluetooth/aidl/default/BluetoothHci.cpp b/bluetooth/aidl/default/BluetoothHci.cpp
index d0ad4a3..4d4896d 100644
--- a/bluetooth/aidl/default/BluetoothHci.cpp
+++ b/bluetooth/aidl/default/BluetoothHci.cpp
@@ -82,7 +82,7 @@
   bool getHasDied() const { return has_died_; }
 
  private:
-  bool has_died_;
+  bool has_died_{false};
 };
 
 void OnDeath(void* cookie) {