imc: remove empty if() block

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/imc.c

@@ -229,9 +229,6 @@ static av_cold int imc_decode_init(AVCodecContext *avctx)
     }
     q->one_div_log2 = 1 / log(2);
 
-    if (avctx->codec_id == CODEC_ID_IAC) {
-    }
-
     if (avctx->codec_id == CODEC_ID_IAC) {
         iac_generate_tabs(q, avctx->sample_rate);
     } else {