K 10
svn:author
V 7
dchagin
K 8
svn:date
V 27
2015-12-27T15:37:07.602125Z
K 7
svn:log
V 438
Verify that tv_sec value specified in settimeofday() and clock_settime()
(CLOCK_REALTIME case) system calls is non negative.
This commit hides a kernel panic in atrtc_settime() as the clock_ts_to_ct()
does not properly convert negative tv_sec.

ps. in my opinion clock_ts_to_ct() should be rewritten to properly handle
negative tv_sec values.

Differential Revision:	https://reviews.freebsd.org/D4714
Reviewed by:		kib

MFC after:	1 week

END