lavfi/tests/filtfmts: Constify a variable.

Fixes the following warning:
libavfilter/tests/filtfmts.c: In function ‘main’:
libavfilter/tests/filtfmts.c:103:18: warning: assignment discards ‘const’ qualifier from pointer target type

diff --git a/libavfilter/tests/filtfmts.c b/libavfilter/tests/filtfmts.c
index 199d74d7a93f6dc943708f84b4032b0d5f621150..72b860ae5b5b41db3eb4daeb65064a4911a59731 100644 (file)
--- a/libavfilter/tests/filtfmts.c
+++ b/libavfilter/tests/filtfmts.c
@@ -73,7 +73,7 @@ static void print_formats(AVFilterContext *filter_ctx)
 
 int main(int argc, char **argv)
 {
-    AVFilter *filter;
+    const AVFilter *filter;
     AVFilterContext *filter_ctx;
     AVFilterGraph *graph_ctx;
     const char *filter_name;