Use mod_timer instead of add_timer in lpfc_els_timeout_handler

This patch was formerly posted by Mark Haverkamp.
http://marc.theaimsgroup.com/?l=linux-scsi&m=114246089015681&w=2Signed-off-by: NMark Haverkamp <markh@osdl.org>
Signed-off-by: NJames Smart <James.Smart@emulex.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>