ignore return value of SDL_GL_CreateContext

src/gui/main.cc

@@ -41,7 +41,7 @@ int main(int argc, char *argv[])
         return 2;
     }
 
-    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
+    (void)SDL_GL_CreateContext(window);
 
     if (gl3wInit() != 0)
     {