scripts/forensic-mark-readonly: Do not depend on printf

There is no need to depend on a separate binary when the shell's builtin
`echo` function will suffice.

Signed-off-by: Glenn Washburn <[email protected]>

Author: crass

config/files/GRMLBASE/etc/udev/scripts/forensic-mark-readonly

@@ -73,12 +73,12 @@ if [ -r /etc/grml/forensic.conf ] ; then
 
   if [ -n "${READONLY_IGNORE:-}" ] ; then
     if [ -n "${parent_device}" ] ; then
-      if printf "%s\n" "${READONLY_IGNORE:-}" | grep -qw "${parent_device}" ; then
+      if echo "${READONLY_IGNORE:-}" | grep -qw "${parent_device}" ; then
         logger -t forensic-mark-readonly "not setting '${BLOCK_DEVICE}' (parent device: '${parent_device}') to read-only as its parent is present in ignore list"
         exit 0
       fi
     fi
-    if printf "%s\n" "${READONLY_IGNORE:-}" | grep -qw "${BLOCK_DEVICE}" ; then
+    if echo "${READONLY_IGNORE:-}" | grep -qw "${BLOCK_DEVICE}" ; then
       logger -t forensic-mark-readonly "not setting '${BLOCK_DEVICE}' to read-only as present in ignore list"
       exit 0
     fi