media: update reference, kerneltrap.org no longer works

kerneltrap.org no longer works, update to a working reference
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Acked-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/media/radio/radio-mr800.c

@@ -32,7 +32,7 @@
  * achievements (specifications given).
  * Also, Faidon Liambotis <paravoid@debian.org> wrote nice driver for this radio
  * in 2007. He allowed to use his driver to improve current mr800 radio driver.
- * http://kerneltrap.org/mailarchive/linux-usb-devel/2007/10/11/342492
+ * http://www.spinics.net/lists/linux-usb-devel/msg10109.html
  *
  * Version 0.01:	First working version.
  * 			It's required to blacklist AverMedia USB Radio