cmGeneratedFileStream: clang-tidy applied to remove redundant ``c_str`` calls

After changing the ``cmGeneratedFileStream`` methods to accept
``std::string const&`` instead of ``const char*`` we don't
need to call ``std::string::c_str`` anymore when passing
a ``std::string`` to a ``cmGeneratedFileStream`` method.

This patch removes all redundant ``std::string::c_str``
calls when passing a string to a ``cmGeneratedFileStream`` method.

It was generated by building CMake with clang-tidy enabled using
the following options:

-DCMAKE_CXX_CLANG_TIDY=/usr/bin/clang-tidy-4.0;-checks=-*,readability-redundant-string-cstr;-fix;-fix-errors

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/CTest/cmCTestLaunch.cxx b/Source/CTest/cmCTestLaunch.cxx
index 0bffde3..09addeb 100644
--- a/Source/CTest/cmCTestLaunch.cxx
+++ b/Source/CTest/cmCTestLaunch.cxx
@@ -345,7 +345,7 @@ void cmCTestLaunch::WriteXML()
   logXML += ".xml";
 
   // Use cmGeneratedFileStream to atomically create the report file.
-  cmGeneratedFileStream fxml(logXML.c_str());
+  cmGeneratedFileStream fxml(logXML);
   cmXMLWriter xml(fxml, 2);
   cmXMLElement e2(xml, "Failure");
   e2.Attribute("type", this->IsError() ? "Error" : "Warning");