Fix two cases of nondeterminism in voting_schedule.c coverage
After another set of coverage-comparison testing, I found the following to cases of nondeterminism in the tests for voting_schedule.c:
--- a/voting_schedule.c.gcov
+++ b/voting_schedule.c.gcov
@@ -61,7 +61,7 @@
-:
1: next += offset;
1: if (next - interval > now)
- #####: next -= interval;
+ 1: next -= interval;
-:
1: return next;
-:}
--- a/voting_schedule.c.gcov
+++ b/voting_schedule.c.gcov
@@ -52,7 +52,7 @@
-:
-: /* Intervals never cross midnight. */
1: if (next > midnight_tomorrow)
- #####: next = midnight_tomorrow;
+ 1: next = midnight_tomorrow;
-:
-: /* If the interval would only last half as long as it's supposed to, then
-: * skip over to the next day. */
I think that these changes are probably dependent on using clock time for our tests, since they all happened around 0:00 UTC.