The branch main has been updated by imp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=5328f9034fc410b105629700a1309bebf094266a

commit 5328f9034fc410b105629700a1309bebf094266a
Author:     Warner Losh <[email protected]>
AuthorDate: 2023-05-01 15:28:32 +0000
Commit:     Warner Losh <[email protected]>
CommitDate: 2023-05-01 21:02:53 +0000

    stand/kboot: Simplify
    
    There's plenty of stack in kboot, so use it here rather than the
    malloc/free dance.
    
    Sponsored by:           Netflix
    Reviewed by:            tsoome, kevans
    Differential Revision:  https://reviews.freebsd.org/D39416
---
 stand/kboot/hostdisk.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/stand/kboot/hostdisk.c b/stand/kboot/hostdisk.c
index 5cc7825034dd..d28530891e0e 100644
--- a/stand/kboot/hostdisk.c
+++ b/stand/kboot/hostdisk.c
@@ -574,7 +574,6 @@ probe_zfs_currdev(uint64_t pool_guid, uint64_t root_guid, 
bool setcurrdev)
 {
        char *devname;
        struct zfs_devdesc currdev;
-       char *buf = NULL;
        bool bootable;
 
        currdev.dd.d_dev = &zfs_dev;
@@ -587,18 +586,15 @@ probe_zfs_currdev(uint64_t pool_guid, uint64_t root_guid, 
bool setcurrdev)
 
        bootable = sanity_check_currdev();
        if (bootable) {
-               buf = malloc(VDEV_PAD_SIZE);
-               if (buf != NULL) {
-                       if (zfs_get_bootonce(&currdev, OS_BOOTONCE, buf,
-                           VDEV_PAD_SIZE) == 0) {
-                               printf("zfs bootonce: %s\n", buf);
-                               if (setcurrdev)
-                                       set_currdev(buf);
-                               setenv("zfs-bootonce", buf, 1);
-                       }
-                       free(buf);
-                       (void)zfs_attach_nvstore(&currdev);
+               char buf[VDEV_PAD_SIZE];
+
+               if (zfs_get_bootonce(&currdev, OS_BOOTONCE, buf, sizeof(buf)) 
== 0) {
+                       printf("zfs bootonce: %s\n", buf);
+                       if (setcurrdev)
+                               set_currdev(buf);
+                       setenv("zfs-bootonce", buf, 1);
                }
+               (void)zfs_attach_nvstore(&currdev);
                init_zfs_boot_options(devname);
        }
        return (bootable);

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