Frameworks: Fix scoping problem in SQLite

Fix the scope of a std::string to avoid a use-after-free.

Test: m && SANITIZE_TARGET=address m
Change-Id: I4b4c299b4ab2c82d76489cc68a398f33b6220e32
diff --git a/core/jni/android_database_SQLiteCommon.cpp b/core/jni/android_database_SQLiteCommon.cpp
index 34544d3..daa2087 100644
--- a/core/jni/android_database_SQLiteCommon.cpp
+++ b/core/jni/android_database_SQLiteCommon.cpp
@@ -223,8 +223,8 @@
     if (sqlite3Message) {
         String8 fullMessage;
         fullMessage.append(sqlite3Message);
-        const char* errcode_msg = sqlite3_error_code_to_msg(errcode).c_str();
-        fullMessage.appendFormat(" (code %s)", errcode_msg); // print extended error code
+        std::string errcode_msg = sqlite3_error_code_to_msg(errcode);
+        fullMessage.appendFormat(" (code %s)", errcode_msg.c_str()); // print extended error code
         if (message) {
             fullMessage.append(": ");
             fullMessage.append(message);