[PATCH] USB: drivers/usb/net/: remove two unused multicast_filter_limit variables

The only uses of both variables were recently removed.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>