lavfi: don't try to indent words in trace messages

The traces end up not indented and ugly anyway, but with the additional
spaces are much more painful to grep/parse.

libavfilter/avfilter.c

@@ -370,7 +370,7 @@ static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
 {
     if (link->type == AVMEDIA_TYPE_VIDEO) {
         av_dlog(ctx,
-                "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
+                "link[%p s:%dx%d fmt:%s %s->%s]%s",
                 link, link->w, link->h,
                 av_pix_fmt_descriptors[link->format].name,
                 link->src ? link->src->filter->name : "",
@@ -381,7 +381,7 @@ static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
         av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
 
         av_dlog(ctx,
-                "link[%p r:%d cl:%s fmt:%-16s %-16s->%-16s]%s",
+                "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
                 link, (int)link->sample_rate, buf,
                 av_get_sample_fmt_name(link->format),
                 link->src ? link->src->filter->name : "",