Merge pull request #491 from nicolasnoble/win32-tmpfile-fix

Freeing the proper string in gpr_tmpfile.

src/core/support/file_win32.c

@@ -76,7 +76,7 @@ end:
     *tmp_filename_out = gpr_tchar_to_char(tmp_filename);
   }
 
-  gpr_free(tmp_filename);
+  gpr_free(template_string);
   return result;
 }