rt2x00: Update MAINTAINERS

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

MAINTAINERS

@@ -5101,6 +5101,7 @@ RALINK RT2X00 WIRELESS LAN DRIVER
 P:	rt2x00 project
 M:	Ivo van Doorn <IvDoorn@gmail.com>
 M:	Gertjan van Wingerde <gwingerde@gmail.com>
+M:	Helmut Schaa <helmut.schaa@googlemail.com>
 L:	linux-wireless@vger.kernel.org
 L:	users@rt2x00.serialmonkey.com (moderated for non-subscribers)
 W:	http://rt2x00.serialmonkey.com/