avtools: fix show_foo() signatures.

show_foo() functions are declared as void show_foo(void), but called as
int show_foo(const char*, const char*).

1 files changed, 2 insertions, 1 deletions

diff --git a/avprobe.c b/avprobe.c
index 270baccf29..996a138576 100644
--- a/avprobe.c
+++ b/avprobe.c
@@ -868,13 +868,14 @@ static void opt_input_file(void *optctx, const char *arg)
     input_filename = arg;
 }
 
-static void show_help(void)
+static int show_help(const char *opt, const char *arg)
 {
     av_log_set_callback(log_callback_help);
     show_usage();
     show_help_options(options, "Main options:\n", 0, 0);
     printf("\n");
     show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);
+    return 0;
 }
 
 static void opt_pretty(void)