[sr-dev] [kamailio/kamailio] ims: fix a crash with contact parsing (PR #3032)

[alexyosifov]

Thank you for your contribution!
What I see from the changes you explicitly set ptr->parsed = NULL. If you check the func "int parse_contact(struct hdr_field* _h)" there is a memory allocation for the contact body:
`row 76: 	b = (contact_body_t*)pkg_malloc(sizeof(contact_body_t));
`
It is possible to lead to a memory leak. I have suspicions that the old code works fine, but the problem, in general, is somewhere else. Maybe where the parsed contact is stored before in-dialog replies or where parsed contact is freed but not set to NULL/0.

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