examples: a few renderer fixes.

examples/renderer/06-textures/textures.c

@@ -119,6 +119,7 @@ SDL_AppResult SDL_AppIterate(void *appstate)
 /* This function runs once at shutdown. */
 void SDL_AppQuit(void *appstate)
 {
+    SDL_DestroyTexture(texture);
     /* SDL will clean up the window/renderer for us. */
 }
 

examples/renderer/07-streaming-textures/streaming-textures.c

@@ -101,6 +101,7 @@ SDL_AppResult SDL_AppIterate(void *appstate)
 /* This function runs once at shutdown. */
 void SDL_AppQuit(void *appstate)
 {
+    SDL_DestroyTexture(texture);
     /* SDL will clean up the window/renderer for us. */
 }
 

examples/renderer/08-rotating-textures/rotating-textures.c

@@ -105,6 +105,7 @@ SDL_AppResult SDL_AppIterate(void *appstate)
 /* This function runs once at shutdown. */
 void SDL_AppQuit(void *appstate)
 {
+    SDL_DestroyTexture(texture);
     /* SDL will clean up the window/renderer for us. */
 }