linuxrc: unbundle is_livecd() from setup_real_root

defaults/initrd.scripts

@@ -225,21 +225,15 @@ is_aufs() {
 }
 
 setup_real_root() {
-	if ! is_livecd
+	if [ -z "${REAL_ROOT}" -a "${FAKE_ROOT}" != "/dev/ram0" ]; then
-	then
-		if [ -z "${REAL_ROOT}" -a "${FAKE_ROOT}" != "/dev/ram0" ]
-		then
 		REAL_ROOT="${FAKE_ROOT}"
 	fi
-		if [ -z "${REAL_INIT}" -a "${FAKE_INIT}" != "/linuxrc" ]
+	if [ -z "${REAL_INIT}" -a "${FAKE_INIT}" != "/linuxrc" ]; then
-		then
 		REAL_INIT="${FAKE_INIT}"
 	fi
-		if [ -z "${REAL_ROOTFLAGS}" ]
+	if [ -z "${REAL_ROOTFLAGS}" ]; then
-		then
 		REAL_ROOTFLAGS="${FAKE_ROOTFLAGS}"
 	fi
-	fi
 }
 
 findmediamount() {

defaults/linuxrc

@@ -244,7 +244,7 @@ done
 
 quiet_kmsg
 
-setup_real_root
+is_livecd || setup_real_root
 
 zfs_init