asrc_anullsrc: return EOF, not -1

diff --git a/libavfilter/asrc_anullsrc.c b/libavfilter/asrc_anullsrc.c
index ed7186d..140ad46 100644 (file)
--- a/libavfilter/asrc_anullsrc.c
+++ b/libavfilter/asrc_anullsrc.c
@@ -31,7 +31,7 @@
 
 static int request_frame(AVFilterLink *link)
 {
-    return -1;
+    return AVERROR_EOF;
 }
 
 static const AVFilterPad avfilter_asrc_anullsrc_outputs[] = {