fftools/ffprobe: Remove redundant checks

A decoder is only opened if there is a decoder for the codec,
so every AVCodecContext here has AVCodecContext.codec set.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

fftools/ffprobe.c

@@ -2561,7 +2561,7 @@ static av_always_inline int process_frame(WriterContext *w,
     int ret = 0, got_frame = 0;
 
     clear_log(1);
-    if (dec_ctx && dec_ctx->codec) {
+    if (dec_ctx) {
         switch (par->codec_type) {
         case AVMEDIA_TYPE_VIDEO:
         case AVMEDIA_TYPE_AUDIO:
@@ -2901,7 +2901,7 @@ static int show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_id
         break;
     }
 
-    if (dec_ctx && dec_ctx->codec && dec_ctx->codec->priv_class && show_private_data) {
+    if (dec_ctx && dec_ctx->codec->priv_class && show_private_data) {
         const AVOption *opt = NULL;
         while (opt = av_opt_next(dec_ctx->priv_data,opt)) {
             uint8_t *str;