[PATCH] e1000_intr build fix

drivers/net/e1000/e1000_main.c: In function `e1000_intr':
drivers/net/e1000/e1000_main.c:3156: error: `i' undeclared (first use in this function)
drivers/net/e1000/e1000_main.c:3156: error: (Each undeclared identifier is reported only once
drivers/net/e1000/e1000_main.c:3156: error: for each function it appears in.)

This function is foul.

Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>