proper error handling in file size retrieval, patch by Ronald S. Bultje...

proper error handling in file size retrieval, patch by Ronald S. Bultje rbultje at ronald bitfreak net

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@7736 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/aviobuf.c

@@ -172,7 +172,9 @@ offset_t url_fsize(ByteIOContext *s)
         return -EPIPE;
     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
     if(size<0){
-        size = s->seek(s->opaque, -1, SEEK_END) + 1;
+        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
+            return size;
+        size++;
         s->seek(s->opaque, s->pos, SEEK_SET);
     }
     return size;