imc: Catch a division by zero

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

libavcodec/imc.c

@@ -449,6 +449,10 @@ static int bit_allocation(IMCContext *q, IMCChannel *chctx,
         iacc  += chctx->bandWidthT[i];
         summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i];
     }
+
+    if (!iacc)
+        return AVERROR_INVALIDDATA;
+
     chctx->bandWidthT[BANDS - 1] = 0;
     summa = (summa * 0.5 - freebits) / iacc;