[glom] Remove unnecessary c_str() calls.

[Murray Cumming <murrayc src gnome org>]

commit 77d9875e8c30eeaf7bc135896f8c0d424a3eef54
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Sep 1 12:57:44 2015 +0200

    Remove unnecessary c_str() calls.

 glom/import_csv/dialog_import_csv.cc |    2 +-
 tests/import/test_signals.cc         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glom/import_csv/dialog_import_csv.cc b/glom/import_csv/dialog_import_csv.cc
index f90a8ce..3440770 100644
--- a/glom/import_csv/dialog_import_csv.cc
+++ b/glom/import_csv/dialog_import_csv.cc
@@ -437,7 +437,7 @@ void Dialog_Import_CSV::begin_parse()
   m_sample_view->set_model(m_sample_model); // Empty model
   m_parser->clear();
 
-  m_parser->set_encoding(get_current_encoding().c_str());
+  m_parser->set_encoding(get_current_encoding());
 
   // Allow the Import button to be pressed when a field for the primary key
   // field is set. When the import button is pressed without the file being
diff --git a/tests/import/test_signals.cc b/tests/import/test_signals.cc
index bf83f22..d56652c 100644
--- a/tests/import/test_signals.cc
+++ b/tests/import/test_signals.cc
@@ -125,7 +125,7 @@ int main()
         std::cout << exception.what() << std::endl;
       }
 
-      parser.set_encoding((*iter).c_str());
+      parser.set_encoding((*iter));
     }