[PATCH] e1000: Fixes e1000_suspend warning when CONFIG_PM is not enabled

drivers/net/e1000/e1000_main.c:3645: warning: `e1000_suspend' defined
but not used

Signed-off-by: Ashutosh Naik <ashutosh_naik@adaptec.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>