Remove redundant .c_str()

googletest/src/gtest.cc

@@ -4091,7 +4091,7 @@ void XmlUnitTestResultPrinter::OutputXmlTestInfo(::std::ostream* stream,
                                                           part.line_number());
       const std::string summary = location + "\n" + part.summary();
       *stream << "      <failure message=\""
-              << EscapeXmlAttribute(summary.c_str())
+              << EscapeXmlAttribute(summary)
               << "\" type=\"\">";
       const std::string detail = location + "\n" + part.message();
       OutputXmlCDataSection(stream, RemoveInvalidXmlCharacters(detail).c_str());