so far only the key part was freed. We also need to free the actual
handler.
Fix:
```
==21171== 1,128 bytes in 47 blocks are definitely lost in loss record
3,476 of 3,670
==21171== at 0x483677F: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==21171== by 0x434248: iq_id_handler_add (iq.c:265)
==21171== by 0x4B122E: omemo_devicelist_request (omemo.c:46)
==21171== by 0x4AC411: omemo_start_session (omemo.c:409)
==21171== by 0x4AC37C: omemo_start_sessions (omemo.c:396)
==21171== by 0x447881: sv_ev_roster_received (server_events.c:189)
==21171== by 0x444019: roster_result_handler (roster.c:312)
==21171== by 0x433FC2: _iq_handler (iq.c:202)
==21171== by 0x5AF118E: ??? (in /usr/lib64/libmesode.so.0.0.0)
==21171== by 0x5AEDBDA: ??? (in /usr/lib64/libmesode.so.0.0.0)
==21171== by 0x5AFA43E: ??? (in /usr/lib64/libmesode.so.0.0.0)
==21171== by 0x6818AA4: ??? (in /usr/lib64/libexpat.so.1.6.8)
==21171== by 0x681A3AB: ??? (in /usr/lib64/libexpat.so.1.6.8)
==21171== by 0x681D7EB: XML_ParseBuffer (in
/usr/lib64/libexpat.so.1.6.8)
==21171== by 0x5AF0A63: xmpp_run_once (in
/usr/lib64/libmesode.so.0.0.0)
==21171== by 0x432E5D: connection_check_events (connection.c:104)
==21171== by 0x4323B3: session_process_events (session.c:255)
==21171== by 0x42C097: prof_run (profanity.c:128)
==21171== by 0x4B2627: main (main.c:172)
```
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