fix memleak in spa_errlog.c

Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Alan Somers <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alek Pinchuk <[email protected]>
Closes #18403

module/zfs/spa_errlog.c

@@ -468,7 +468,7 @@ check_filesystem(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep,
 	kmem_free(zc, sizeof (*zc));
 
 out:
-	kmem_free(snap_obj_array, sizeof (*snap_obj_array));
+	kmem_free(snap_obj_array, snap_count * sizeof (*snap_obj_array));
 	return (error);
 }