initrd.scripts: move mount_sysfs to 00-fsdev.sh

defaults/initrd.d/00-fsdev.sh

@@ -2,6 +2,12 @@
 
 . /etc/initrd.d/00-common.sh
 
+mount_sysfs() {
+    mount -t sysfs sysfs /sys -o noexec,nosuid,nodev \
+        >/dev/null 2>&1 && return 0
+    bad_msg "Failed to mount /sys!"
+}
+
 find_real_device() {
     local device="${1}"
     local out=

defaults/initrd.scripts

@@ -33,12 +33,6 @@ bootstrap_key() {
     media_find "key" "${keyloc}" "CRYPT_${1}_KEYDEV" "/mnt/key" ${KEYDEVS}
 }
 
-mount_sysfs() {
-    mount -t sysfs sysfs /sys -o noexec,nosuid,nodev >/dev/null 2>&1
-    ret=$?
-    [ ${ret} -eq 0 ] || bad_msg "Failed to mount /sys!"
-}
-
 find_nfs() {
     if [ -z "${IP}" ]; then
         # IP is not set, return straight away