cmdutils: fix opt_values leak

Add free to uninit_opts and relocate opt_names to same
Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 3a6a9cdf)

cmdutils.c

@@ -78,6 +78,8 @@ void uninit_opts(void)
 #if CONFIG_SWSCALE
     av_freep(&sws_opts);
 #endif
+    av_freep(&opt_names);
+    av_freep(&opt_values);
 }
 
 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl)

ffmpeg.c

@@ -534,7 +534,6 @@ static int ffmpeg_exit(int ret)
         fclose(vstats_file);
     av_free(vstats_filename);
 
-    av_free(opt_names);
     av_free(streamid_map);
     av_free(input_codecs);
     av_free(output_codecs);