ijksdl: add SDL_VouFreeOverlay

ijkmediaplayer/jni/ijkplayer/ff_ffplay.c

@@ -473,7 +473,7 @@ static void stream_close(FFPlayer *ffp)
         avfilter_unref_bufferp(&vp->picref);
 #endif
         if (vp->bmp) {
-            SDL_FreeYUVOverlay(vp->bmp);
+            SDL_VoutFreeYUVOverlay(vp->bmp);
             vp->bmp = NULL;
         }
     }

ijkmediaplayer/jni/ijksdl/ijksdl_vout.c

@@ -43,3 +43,15 @@ SDL_VoutSurface *SDL_VoutSetVideoMode(SDL_Vout *vout, int w, int h, int bpp, Uin
     assert(vout);
     return vout->set_video_mode(vout, w, h, bpp, flags);
 }
+
+void SDL_VouFreeOverlay(SDL_VoutOverlay *overlay)
+{
+    if (!overlay)
+        return;
+
+    if (overlay->free_l) {
+        overlay->free_l(overlay);
+    } else {
+        free(overlay);
+    }
+}