usb-storage: MAINTAINERS: Alan Stern is the new maintainer

At Matt Dharm's request, I am taking over maintainership of the
usb-storage driver.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -12163,7 +12163,7 @@ S:	Maintained
 F:	drivers/net/usb/lan78xx.*
 
 USB MASS STORAGE DRIVER
-M:	Matthew Dharm <mdharm-usb@one-eyed-alien.net>
+M:	Alan Stern <stern@rowland.harvard.edu>
 L:	linux-usb@vger.kernel.org
 L:	usb-storage@lists.one-eyed-alien.net
 S:	Maintained