libavcodec: be less picky on nonsense rc_max_rate / rc_buffer_size combinations.

Some applications use these combinations and to maintain ABI
compatibility with previous versions we should not suddenly
fail. Thus only display a warning for the newly detected cases
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo_enc.c

@@ -390,6 +390,7 @@ av_cold int ff_MPV_encode_init(AVCodecContext *avctx)
 
     if ((!avctx->rc_max_rate) != (!avctx->rc_buffer_size)) {
         av_log(avctx, AV_LOG_ERROR, "Either both buffer size and max rate or neither must be specified\n");
+        if (avctx->rc_max_rate && !avctx->rc_buffer_size)
             return -1;
     }