[SCSI] bnx2i: fix null ptr ref in conn get param

bnx2i has some checks to try and make sure the ep
is not destroyed while the addr/port is getting
read. However, if after this check:

if (!(bnx2i_conn && bnx2i_conn->ep && bnx2i_conn->ep->hba))
	goto out;

bnx2i_conn->ep is cleared by ep_disconnect then we will
oops.

This patches fixes the problem by having the driver
use the get_ep_param callback instead of get_conn_param.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>