Fix possible nullptr dereferences in toxav/msi.c
Comment out extra argument to sprintf
Merge branch 'tux3-nullptr-1'
Merge branch 'sprintf-extra-arg-1' of https://github.com/tux3/toxcore into tux3-sprintf-extra-arg-1
Included assert.h for Messenger/DHT.c
Merge branch 'master' of https://github.com/Jman012/toxcore into Jman012-master