hooks/*: code cleanup

hooks/lvm/lvm

@@ -1,7 +1,7 @@
 # vim: set ft=sh:
 # shellcheck shell=sh
 #
-# false positive
+# https://www.shellcheck.net/wiki/SC2154
 # shellcheck disable=2154
 
 [ "$hostonly" = 1 ] &&

hooks/lvm/lvm.init

@@ -1,11 +1,9 @@
 # vim: set ft=sh:
 # shellcheck shell=sh
 #
-# false positive
-# shellcheck disable=2154
-#
-# word splitting is safe by design
-# shellcheck disable=2068
+# https://www.shellcheck.net/wiki/SC2154
+# https://www.shellcheck.net/wiki/SC2068
+# shellcheck disable=2154,2068
 
 [ "$break" = lvm ] && { print "break before lvm.init"; sh; }