tools/probetest: replace the deprecated API

Signed-off-by: Zhong Li <zhongli_dev@126.com>

tools/probetest.c

@@ -38,9 +38,10 @@ static const char *single_format;
 static void probe(AVProbeData *pd, int type, int p, int size)
 {
     int i = 0;
-    AVInputFormat *fmt = NULL;
+    const AVInputFormat *fmt = NULL;
+    void *fmt_opaque = NULL;
 
-    while ((fmt = av_iformat_next(fmt))) {
+    while ((fmt = av_demuxer_iterate(&fmt_opaque))) {
         if (fmt->flags & AVFMT_NOFILE)
             continue;
         if (fmt->read_probe &&
@@ -66,8 +67,9 @@ static void print_times(void)
 {
     int i = 0;
     AVInputFormat *fmt = NULL;
+    void *fmt_opaque = NULL;
 
-    while ((fmt = av_iformat_next(fmt))) {
+    while ((fmt = av_demuxer_iterate(&fmt_opaque))) {
         if (fmt->flags & AVFMT_NOFILE)
             continue;
         if (time_array[i] > 1000000) {