vfwcap: Update error message:

- Verbose debug information is at max -v 9 now;
- Add an empty space for readability.

Originally committed as revision 19541 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavdevice/vfwcap.c

@@ -327,8 +327,8 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     av_set_pts_info(st, 32, 1, 1000);
 
     if(codec->pix_fmt == -1) {
-        av_log(s, AV_LOG_ERROR, "Unknown compression type."
-                         "Please report verbose (-v 99) debug information.\n");
+        av_log(s, AV_LOG_ERROR, "Unknown compression type. "
+                         "Please report verbose (-v 9) debug information.\n");
         vfw_read_close(s);
         return AVERROR_PATCHWELCOME;
     }