Revert^2 "libandroidfw hardening for IncFs"

55ef6167a2c235bd88c7216238b2001b46795b79

Change-Id: I02d4890d181655dfd0a14c188468db512559d27b
Merged-In: I02d4890d181655dfd0a14c188468db512559d27b
diff --git a/libs/androidfw/tests/CommonHelpers.cpp b/libs/androidfw/tests/CommonHelpers.cpp
index faa5350..3396729 100644
--- a/libs/androidfw/tests/CommonHelpers.cpp
+++ b/libs/androidfw/tests/CommonHelpers.cpp
@@ -58,8 +58,9 @@
 }
 
 std::string GetStringFromPool(const ResStringPool* pool, uint32_t idx) {
-  String8 str = pool->string8ObjectAt(idx);
-  return std::string(str.string(), str.length());
+  auto str = pool->string8ObjectAt(idx);
+  CHECK(str.has_value()) << "failed to find string entry";
+  return std::string(str->string(), str->length());
 }
 
 }  // namespace android