Documentation/dvb/get_dvb_firmware: fix firmware URL

This patch fixes a wrong URL in Documentation/dvb/get_dvb_firmware.

This patch fixes kernel Bugzilla #4301.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/dvb/get_dvb_firmware

@@ -246,7 +246,7 @@ sub vp7041 {
 }
 
 sub dibusb {
-	my $url = "http://www.linuxtv.org/downloads/firmware/dvb-dibusb-5.0.0.11.fw";
+	my $url = "http://www.linuxtv.org/downloads/firmware/dvb-usb-dibusb-5.0.0.11.fw";
 	my $outfile = "dvb-dibusb-5.0.0.11.fw";
 	my $hash = "fa490295a527360ca16dcdf3224ca243";