[KMSDRM] Improve the way to test if last window is being destroyed.
diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c
index 703b876..4e4569d 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.c
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c
@@ -1088,7 +1088,7 @@ KMSDRM_DestroyWindow(_THIS, SDL_Window *window)
KMSDRM_DestroySurfaces(_this, window);
/* Unload library and deinit GBM, but only if this is the last remaining window.*/
- if (viddata->num_windows < 2) {
+ if ((viddata->num_windows - 1) == 0) {
/* Unload EGL/GL library and free egl_data. */
if (_this->egl_data) {