cmdutils: use av_mallocz_array()

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

cmdutils.c

@@ -662,7 +662,7 @@ static void init_parse_context(OptionParseContext *octx,
     memset(octx, 0, sizeof(*octx));
 
     octx->nb_groups = nb_groups;
-    octx->groups    = av_mallocz(sizeof(*octx->groups) * octx->nb_groups);
+    octx->groups    = av_mallocz_array(octx->nb_groups, sizeof(*octx->groups));
     if (!octx->groups)
         exit_program(1);
 
@@ -1966,7 +1966,7 @@ AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
 
     if (!s->nb_streams)
         return NULL;
-    opts = av_mallocz(s->nb_streams * sizeof(*opts));
+    opts = av_mallocz_array(s->nb_streams, sizeof(*opts));
     if (!opts) {
         av_log(NULL, AV_LOG_ERROR,
                "Could not alloc memory for stream options.\n");