fixed file descriptor and possible memory leak

examples/fakecapture.c

@@ -55,8 +55,13 @@ capture_get_frame(media_stream *stream)
    res->sz = read(fd, res->data, FRAME_BUF_SZ);
    if(res->sz < 0) {
        perror("fakecapture:capture_get_frame:read");
-       return NULL;
+       free(res);
+       res=NULL;
+   }
+   if(close){
+       perror("Warning! fakecapture:capture_get_frame:close");
    }
+
    return res;
 }