pjproject: Fixes to resolve DNS SRV crashes.

* Re #1945 (misc): Don't trigger SRV complete callback when there is a
parse error.

* srv_resolver.c: Don't try to send query if already considered resolved.

** In resolve_hostnames() don't try to resolve a query that is already
considered resolved.

** In resolve_hostnames() fix DNS typo in comments.

** In build_server_entries() move a common expression assigning to cnt
earlier.

* sip_transport.c: Fix tdata object name to actually contain the pointer.

It helps if the logs referencing a tdata object buffer actually have a
name that includes the correct pointer as part of the name.  Also since
the tdata has its own pool it helps if any logs referencing the pool have
the same name as the tdata object.  This change brings tdata logging in
line with how tsx objects are named.

ASTERISK-26669 #close
ASTERISK-26738 #close

Change-Id: I56af2ded25476b3e870ca586ee69ed6954ef75af