Use url_fopen error code when opening input file

handle the AVERROR_NOENT error case in print_error

Originally committed as revision 8977 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -417,8 +417,7 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
 
     if (!fmt || must_open_file) {
         /* if no file needed do not try to open one */
-        if (url_fopen(pb, filename, URL_RDONLY) < 0) {
-            err = AVERROR_IO;
+        if ((err=url_fopen(pb, filename, URL_RDONLY)) < 0) {
             goto fail;
         }
         file_opened = 1;