display_set_fps_limit: sanitize input argument

src/display.c

@@ -635,16 +635,18 @@ float display_get_delta_time(void)
 
 void display_set_fps_limit(float fps)
 {
+    assert(fps >= 0.0f);
+
     disable_interrupts();
 
-    min_refresh_period = 1.0f / (fps ? fps : refresh_rate);
+    min_refresh_period = 1.0f / (fps ? MIN(fps, refresh_rate) : refresh_rate);
     frame_skip = refresh_period / min_refresh_period;
     delta_time = min_refresh_period;
 
     // Calculate also the minimum period using a rounded refresh rate
     // This will be used only for display purposes, so that FPS are capped
     // to 60 Hz rather than 59.83 Hz, which would be the hw-accurate value.
-    min_refresh_period_rounded = 1.0f / (fps ? fps : roundf(refresh_rate));
+    min_refresh_period_rounded = 1.0f / (fps ? MIN(fps, roundf(refresh_rate)) : roundf(refresh_rate));
 
     enable_interrupts();
 }