The branch stable/12 has been updated by kp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=555726fda685ab5be9ccdbfcb73b9336dc2d75af

commit 555726fda685ab5be9ccdbfcb73b9336dc2d75af
Author:     Kristof Provost <k...@freebsd.org>
AuthorDate: 2018-11-02 19:23:50 +0000
Commit:     Kristof Provost <k...@freebsd.org>
CommitDate: 2021-02-28 15:36:29 +0000

    pf: Fix build if INVARIANTS is not set
    
    r340061 included a number of assertions pf_frent_remove(), but these 
assertions
    were the only use of the 'prev' variable. As a result builds without
    INVARIANTS had an unused variable, and failed.
    
    Reported by:    vangyzen@
    
    (cherry picked from commit 58ef854f8b05508f41aff3bdaf1564c8dd4c1d4f)
---
 sys/netpfil/pf/pf_norm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/netpfil/pf/pf_norm.c b/sys/netpfil/pf/pf_norm.c
index eb310e27b9ae..0770fcfd4c58 100644
--- a/sys/netpfil/pf/pf_norm.c
+++ b/sys/netpfil/pf/pf_norm.c
@@ -445,7 +445,9 @@ pf_frent_insert(struct pf_fragment *frag, struct pf_frent 
*frent,
 void
 pf_frent_remove(struct pf_fragment *frag, struct pf_frent *frent)
 {
+#ifdef INVARIANTS
        struct pf_frent *prev = TAILQ_PREV(frent, pf_fragq, fr_next);
+#endif
        struct pf_frent *next = TAILQ_NEXT(frent, fr_next);
        int index;
 
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