libspeexenc: Fix assignments in if()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libspeexenc.c

@@ -288,7 +288,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
             speex_encode_stereo_int(samples, s->header.frame_size, &s->bits);
         speex_encode_int(s->enc_state, samples, &s->bits);
         s->pkt_frame_count++;
-        if ((ret = ff_af_queue_add(&s->afq, frame) < 0))
+        if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
             return ret;
     } else {
         /* handle end-of-stream */