linuxrc: move REAL_ROOT* setup to setup_real_root()

defaults/initrd.scripts

@@ -209,6 +209,23 @@ uppercase() {
 	echo $1 | tr 'a-z' 'A-Z'
 }
 
+setup_real_root() {
+	if [ "${CDROOT}" = '0' ]
+	then
+		if [ -z "${REAL_ROOT}" -a "${FAKE_ROOT}" != "/dev/ram0" ]
+		then
+			REAL_ROOT="${FAKE_ROOT}"
+		fi
+		if [ -z "${REAL_INIT}" -a "${FAKE_INIT}" != "/linuxrc" ]
+		then
+			REAL_INIT="${FAKE_INIT}"
+		fi
+		if [ -z "${REAL_ROOTFLAGS}" ]
+		then
+			REAL_ROOTFLAGS="${FAKE_ROOTFLAGS}"
+		fi
+	fi
+}
 
 findmediamount() {
 	# $1 = mount dir name / media name

defaults/linuxrc

@@ -244,21 +244,7 @@ done
 
 quiet_kmsg
 
-if [ "${CDROOT}" = '0' ]
-then
-	if [ -z "${REAL_ROOT}" -a "${FAKE_ROOT}" != "/dev/ram0" ]
-	then
-		REAL_ROOT="${FAKE_ROOT}"
-	fi
-	if [ -z "${REAL_INIT}" -a "${FAKE_INIT}" != "/linuxrc" ]
-	then
-		REAL_INIT="${FAKE_INIT}"
-	fi
-	if [ -z "${REAL_ROOTFLAGS}" ]
-	then
-		REAL_ROOTFLAGS="${FAKE_ROOTFLAGS}"
-	fi
-fi
+setup_real_root
 
 zfs_init