git: a463db46a11c - stable/13 - bsdinstall zfsboot: Don't override ZFSBOOT_FORCE_4K_SECTORS if it is null.

The branch stable/13 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=a463db46a11ce84da39206c493ab0c4c02c29eb1

commit a463db46a11ce84da39206c493ab0c4c02c29eb1
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2023-11-18 19:18:29 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2024-01-05 00:21:59 +0000

    bsdinstall zfsboot: Don't override ZFSBOOT_FORCE_4K_SECTORS if it is null.
    
    Only set a default value of 1 if the shell variable is unset.  This allows
    installer scripts to disable the variable.
    
    PR:             274513
    Reported by:    Albin "a12l" Otterhäll <bugs.freebsd.org@a12l.xyz>
    Differential Revision:  https://reviews.freebsd.org/D42319
    
    (cherry picked from commit de82aed1192470574a08d3e479d81c4c1280487a)
---
 usr.sbin/bsdinstall/scripts/zfsboot | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usr.sbin/bsdinstall/scripts/zfsboot b/usr.sbin/bsdinstall/scripts/zfsboot
index 7028ee9ced91..bd7db75dc5e5 100755
--- a/usr.sbin/bsdinstall/scripts/zfsboot
+++ b/usr.sbin/bsdinstall/scripts/zfsboot
@@ -66,7 +66,7 @@ f_include $BSDCFG_SHARE/variable.subr
 #
 # Should we use sysctl(8) vfs.zfs.min_auto_ashift=12 to force 4K sectors?
 #
-: ${ZFSBOOT_FORCE_4K_SECTORS:=1}
+: ${ZFSBOOT_FORCE_4K_SECTORS=1}
 
 #
 # Should we use geli(8) to encrypt the drives?