PPS roll indicator bit in event status (bit[1]) is wrong

[barawn]

It really doesn't matter, but the roll indicator for PPS here:

firmware-radiant/hdl/radiant_event_ctrl.v

Line 113 in 0201484

wire roll_sec = (cur_sysclk_count[32] ^ last_high_sec);

is obviously wrong, since it compares bit[32] of the sysclk counter to bit[32] of the PPS counter. It's pointless to fix this here because we never implemented "load next PPS to this value," but wanted to make sure it was documented.