lavfi/f_streamselect: drop useless query_formats() callback

It achieves the same effect as ff_default_query_formats(), which gets
called implicitly.

libavfilter/f_streamselect.c

@@ -296,31 +296,10 @@ static av_cold void uninit(AVFilterContext *ctx)
     ff_framesync_uninit(&s->fs);
 }
 
-static int query_formats(AVFilterContext *ctx)
-{
-    AVFilterFormats *formats;
-    int ret, i;
-
-    for (i = 0; i < ctx->nb_inputs; i++) {
-        formats = ff_all_formats(ctx->inputs[i]->type);
-        if ((ret = ff_set_common_formats(ctx, formats)) < 0)
-            return ret;
-
-        if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
-            if ((ret = ff_set_common_all_samplerates   (ctx)) < 0 ||
-                (ret = ff_set_common_all_channel_counts(ctx)) < 0)
-                return ret;
-        }
-    }
-
-    return 0;
-}
-
 const AVFilter ff_vf_streamselect = {
     .name            = "streamselect",
     .description     = NULL_IF_CONFIG_SMALL("Select video streams"),
     .init            = init,
-    FILTER_QUERY_FUNC(query_formats),
     .process_command = process_command,
     .uninit          = uninit,
     .activate        = activate,
@@ -334,7 +313,6 @@ const AVFilter ff_af_astreamselect = {
     .description     = NULL_IF_CONFIG_SMALL("Select audio streams"),
     .priv_class      = &streamselect_class,
     .init            = init,
-    FILTER_QUERY_FUNC(query_formats),
     .process_command = process_command,
     .uninit          = uninit,
     .activate        = activate,