Check for CR in correct string.

shaders/glsl.cpp

@@ -64,15 +64,15 @@ std::vector<std::string> read_file_lines(const char *filename)
     std::string string_contents(file_contents);
     delete[] file_contents;
 
-    std::istringstream ss(string_contents);
+    for (char &c : string_contents)
-    std::string line;
-
-    for (char &c : line)
     {
         if (c == '\r')
             c = '\n';
     }
 
+    std::istringstream ss(string_contents);
+    std::string line;
+
     while (std::getline(ss, line, '\n'))
         if (!line.empty())
             lines.push_back(line);