avcodec/qtrleenc: use av_mallocz_array()

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

libavcodec/qtrleenc.c

@@ -106,7 +106,7 @@ static av_cold int qtrle_encode_init(AVCodecContext *avctx)
 
     s->rlecode_table = av_mallocz(s->logical_width);
     s->skip_table    = av_mallocz(s->logical_width);
-    s->length_table  = av_mallocz((s->logical_width + 1)*sizeof(int));
+    s->length_table  = av_mallocz_array(s->logical_width + 1, sizeof(int));
     if (!s->skip_table || !s->length_table || !s->rlecode_table) {
         av_log(avctx, AV_LOG_ERROR, "Error allocating memory.\n");
         return AVERROR(ENOMEM);