call writes messages to stdout using printf(). it writes data

	from the ax25 connection using write(0). everything was fine
	as long as call wrote to stdout.
	If instead we use output redirection to a file or stdout
	(> foo, | bar), then the messages like "Connected to.." appeared
	at the end of the connection.
	I guess it's a glibc issue that printf (whih is buffered) behaves
	different when stdout is redirected.
	Fixed using fflush() after each printf().

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