Fix assertion failure with next_phase_at in snapbuild.c

When Who What
2023-07-04 15:43:39 Daniel Gustafsson (d_gustafsson) Closed in commitfest 2023-07 with status: Committed
2023-07-04 15:43:34 Daniel Gustafsson (d_gustafsson) Added d_gustafsson as committer
2023-07-04 15:43:32 Daniel Gustafsson (d_gustafsson) Added d_gustafsson as reviewer
2023-04-10 00:45:23 Greg Stark (stark) Closed in commitfest 2023-03 with status: Moved to next CF
2023-03-24 03:41:48 Greg Stark (stark) New status: Ready for Committer
2023-01-29 15:49:46 Masahiko Sawada (masahikosawada) Changed authors to Masahiko Sawada (masahikosawada)
2023-01-29 15:49:25 Masahiko Sawada (masahikosawada) Attached mail thread 17695-6be9277c9295985f@postgresql.org
2023-01-29 15:49:25 Masahiko Sawada (masahikosawada) Created patch record