Always kill invalid file transfers when receiving file controls.

Previously, toxcore would send a kill control to the friend only if the
file control was valid. Determining which file transfer is used does not
depend on the specific file control. We can always kill it in that case.

Also, added some logging for file control logic, since there is no other
feedback on error (failure of the file control handler is swallowed).

0 files changed, 0 insertions, 0 deletions