Merge commit '9835bc0' into dtls

* commit '9835bc0':
  Fix racy test.
  Fix stupid error in previous commit
  Don't check errors on ssl_close_notify()
  Fix char signedness issue
  Fix issue with non-blocking I/O & record splitting
  Fix warning

Conflicts:
	programs/ssl/ssl_client2.c
	programs/ssl/ssl_server2.c