apv_decode: allocate the hwaccel private data unconditionally

ff_hwaccel_frame_priv_alloc() is a no-op without a hwaccel, so the
check around it is redundant.

libavcodec/apv_decode.c

@@ -383,11 +383,9 @@ static int apv_decode(AVCodecContext *avctx, AVFrame *output,
 
     apv_derive_tile_info(tile_info, &input->frame_header);
 
-    if (avctx->hwaccel) {
-        err = ff_hwaccel_frame_priv_alloc(avctx, &apv->hwaccel_picture_private);
-        if (err < 0)
-            return err;
-    }
+    err = ff_hwaccel_frame_priv_alloc(avctx, &apv->hwaccel_picture_private);
+    if (err < 0)
+        return err;
 
     ff_thread_finish_setup(avctx);