Crash on call while peer calling you

[isotoxin]

How to reproduce:

1. Alice begin call to Bob and Bob begin call to Alice simultaneously.
2. Alice pressed hangup button and get crash.
3. Bob pressed hangup button and get crash.

Root of problem:
in file msi.c, in function handle_init FAILURE occurred. This mean unexpected kill_call called. So, MSICall object suddenly destroyed. Now we get dead pointer: ToxAV->calls[friend_number].msi_call
And final action: toxav_call_control get this pointer by call_get and crashed.

[iphydf]

Cool! Can you create a new file with a test case that triggers the error and make a PR? That test case should fail, so we can't merge it, but we can base the fix on that test.

[iphydf]

@isotoxin does this still occur?

[iphydf]

This seems to be fixed.