diff --git a/libavcodec/ptx.c b/libavcodec/ptx.c
index 28df0b6f2e..426f46ce6c 100644
--- a/libavcodec/ptx.c
+++ b/libavcodec/ptx.c
@@ -51,14 +51,14 @@ static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     bytes_per_pixel = AV_RL16(buf+12) >> 3;
 
     if (bytes_per_pixel != 2) {
-        av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
+        av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
         return -1;
     }
 
     avctx->pix_fmt = PIX_FMT_RGB555;
 
     if (offset != 0x2c)
-        av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
+        av_log_ask_for_sample(avctx, "offset != 0x2c\n");
 
     buf += offset;
 
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index cafcf857c5..8e228c6c34 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -1124,12 +1124,8 @@ static void asf_reset_header(AVFormatContext *s)
 
 static int asf_read_close(AVFormatContext *s)
 {
-    int i;
-
     asf_reset_header(s);
-    for(i=0;i<s->nb_streams;i++) {
-        AVStream *st = s->streams[i];
-    }
+
     return 0;
 }