b43legacy: add me as maintainer and fix URLs

As b43legacy is going to be orphaned, add me as a maintainer. Fix URLs for
the related website and fix my e-mail address in MAINTAINERS file.
Signed-off-by: NStefano Brivio <stefano.brivio@polimi.it>
Cc: Larry Finger <larry.finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -787,23 +787,25 @@ B43 WIRELESS DRIVER
 P:	Michael Buesch
 M:	mb@bu3sch.de
 P:	Stefano Brivio
-M:	st3@riseup.net
+M:	stefano.brivio@polimi.it
 L:	linux-wireless@vger.kernel.org
-W:	http://bcm43xx.berlios.de/
+W:	http://linuxwireless.org/en/users/Drivers/b43
 S:	Maintained
 
 B43LEGACY WIRELESS DRIVER
 P:	Larry Finger
 M:	Larry.Finger@lwfinger.net
+P:	Stefano Brivio
+M:	stefano.brivio@polimi.it
 L:	linux-wireless@vger.kernel.org
-W:	http://bcm43xx.berlios.de/
+W:	http://linuxwireless.org/en/users/Drivers/b43
 S:	Maintained
 
 BCM43XX WIRELESS DRIVER (SOFTMAC BASED VERSION)
 P:	Larry Finger
 M:	Larry.Finger@lwfinger.net
 P:	Stefano Brivio
-M:	st3@riseup.net
+M:	stefano.brivio@polimi.it
 L:	linux-wireless@vger.kernel.org
 W:	http://bcm43xx.berlios.de/
 S:	Maintained