Revert "vaapi: return early from ff_vaapi_render_picture() without picture"

This reverts commit 4cbf245f2a.

I messed up the author information.

libavcodec/vaapi.c

@@ -46,9 +46,6 @@ int ff_vaapi_render_picture(struct vaapi_context *vactx, VASurfaceID surface)
     VABufferID va_buffers[3];
     unsigned int n_va_buffers = 0;
 
-    if (!vactx->pic_param_buf_id)
-        return 0;
-
     vaUnmapBuffer(vactx->display, vactx->pic_param_buf_id);
     va_buffers[n_va_buffers++] = vactx->pic_param_buf_id;