Make GCC happier with initializer lists.

Change-Id: Ib2623116621797b1136633f0fe3e95168ebca678
diff --git a/authorization_set.cpp b/authorization_set.cpp
index 3a5b46e..09093c9 100644
--- a/authorization_set.cpp
+++ b/authorization_set.cpp
@@ -206,12 +206,12 @@
     return true;
 }
 
-keymaster_key_param_t empty_set = {};
+keymaster_key_param_t empty_set = {KM_TAG_INVALID, {}};
 keymaster_key_param_t& AuthorizationSet::operator[](int at) {
     if (is_valid() == OK && at < (int)elems_size_) {
         return elems_[at];
     }
-    empty_set = {};
+    empty_set = {KM_TAG_INVALID, {}};
     return empty_set;
 }
 
@@ -219,7 +219,7 @@
     if (is_valid() == OK && at < (int)elems_size_) {
         return elems_[at];
     }
-    empty_set = {};
+    empty_set = {KM_TAG_INVALID, {}};
     return empty_set;
 }