Review variables initialization

examples/others/rlgl_standalone.c

@@ -131,7 +131,7 @@ int main(void)
     rlClearColor(245, 245, 245, 255);                   // Define clear color
     rlEnableDepthTest();                                // Enable DEPTH_TEST for 3D
     
-    Camera camera;
+    Camera camera = { 0 };
     camera.position = (Vector3){ 5.0f, 5.0f, 5.0f };    // Camera position
     camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };      // Camera looking at point
     camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)