staging: lustre: fix sparse warning "should it be static"

Fix the following warning in lib-eq.c
warning: symbol 'lnet_eq_dequeue_event' was not declared. Should it be static?

Signed-off-by: Toby Smith <toby@tismith.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>