[sr-dev] couple of xavp questions

[jh at tutpro.com]

i got rid of the crash by changing

	xavp_rm(xavp, xavp_list);

calls to

        xavp_rm(xavp, NULL);

where xavp_list is

    xavp_list = xavp_get(&contacts_avp, NULL);

i.e., pointer to the first xavp with the given name, and xavp is also
pointer to the first xavp in the list.

looks like the first version of xavp_rm caused _xavp_list_crt to point
to already removed xavp.

what i try to accomplish is to pop xavps from the head of the list one at
a time.

-- juha