ffprobe: prefer av_freep() over av_free() for global print_format option.

It could be re-used for instance in case ffprobe would support multiple
input files.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffprobe.c b/ffprobe.c
index 52b33f8b59..470001c406 100644
--- a/ffprobe.c
+++ b/ffprobe.c
@@ -842,7 +842,7 @@ static int probe_file(const char *filename)
     writer_close(&wctx);
 
 end:
-    av_free(print_format);
+    av_freep(&print_format);
 
     return ret;
 }