The branch main has been updated by dim:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=c9dde6f0c713a027266c52cf94a33a086348c566

commit c9dde6f0c713a027266c52cf94a33a086348c566
Author:     Dimitry Andric <d...@freebsd.org>
AuthorDate: 2022-07-26 19:30:41 +0000
Commit:     Dimitry Andric <d...@freebsd.org>
CommitDate: 2022-07-26 19:32:51 +0000

    Fix unused variable warning in ffs_snapshot.c
    
    With clang 15, the following -Werror warning is produced:
    
        sys/ufs/ffs/ffs_snapshot.c:204:7: error: variable 'redo' set but not 
used [-Werror,-Wunused-but-set-variable]
                long redo = 0, snaplistsize = 0;
                     ^
    
    The 'redo' variable is only used when DIAGNOSTIC is defined. Ensure it
    is only declared and set in that case.
    
    MFC after:      3 days
---
 sys/ufs/ffs/ffs_snapshot.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sys/ufs/ffs/ffs_snapshot.c b/sys/ufs/ffs/ffs_snapshot.c
index a23c4ab02bf6..84983a111fe4 100644
--- a/sys/ufs/ffs/ffs_snapshot.c
+++ b/sys/ufs/ffs/ffs_snapshot.c
@@ -201,7 +201,10 @@ ffs_snapshot(struct mount *mp, char *snapfile)
        ufs2_daddr_t blockno;
        uint64_t flag;
        char saved_nice = 0;
-       long redo = 0, snaplistsize = 0;
+#ifdef DIAGNOSTIC
+       long redo = 0;
+#endif
+       long snaplistsize = 0;
        int32_t *lp;
        void *space;
        struct fs *copy_fs = NULL, *fs;
@@ -457,7 +460,9 @@ restart:
        for (cg = 0; cg < fs->fs_ncg; cg++) {
                if ((ACTIVECGNUM(fs, cg) & ACTIVECGOFF(cg)) != 0)
                        continue;
+#ifdef DIAGNOSTIC
                redo++;
+#endif
                error = UFS_BALLOC(vp, lfragtosize(fs, cgtod(fs, cg)),
                    fs->fs_bsize, KERNCRED, 0, &nbp);
                if (error)

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