Tai-hwa Liang 2d4420789d According to the comment in struct tty, t_modem is optional; hence we should
guard against NULL t_modem entry. Otherwise, driver doesn't have t_modem
callback implemented(such like sys/dev/usb/ucycom.c) would panic when
someone opens the driver's associated tty device.

Reviewed by:	phk, sam (mentor)
2005-04-13 13:56:17 +00:00
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