Remove un-needed check for NULL pointer. They were previously checked just before.

src/video/SDL_video.c

@@ -1302,9 +1302,8 @@ SDL_GetWindowDisplayMode(SDL_Window * window, SDL_DisplayMode * mode)
         return SDL_SetError("Couldn't find display mode match");
     }
 
-    if (mode) {
-        *mode = fullscreen_mode;
-    }
+    *mode = fullscreen_mode;
+
     return 0;
 }
 

src/video/kmsdrm/SDL_kmsdrmvideo.c

@@ -308,8 +308,8 @@ KMSDRM_CreateDevice(void)
     return device;
 
 cleanup:
-    if (device)
-        SDL_free(device);
+    SDL_free(device);
+
     if (viddata)
         SDL_free(viddata);
     return NULL;