firstboot: detect mtd, rom & jffs parts first, fix jffs mounted test

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19980 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/sbin/firstboot

@@ -12,11 +12,15 @@ for fb_source_file in /lib/firstboot/*; do
     . $fb_source_file
 done
 
+set_mtd_part
+set_rom_part
+set_jffs_part
+
 # invoked as an executable
 if [ "${0##*/}" = "firstboot" ]; then
     if [ "$1" = "switch2jffs" ]; then
 	boot_run_hook switch2jffs
-    elif [ -z "$jffs" ]; then
+    elif [ -n "$jffs" ]; then
 	reset_has_fo=true
 	echo "firstboot has already been run"
 	echo "jffs2 partition is mounted, only resetting files"
@@ -26,9 +30,5 @@ if [ "${0##*/}" = "firstboot" ]; then
 	mount "$mtdpart" /jffs -t jffs2
 	fopivot /jffs /rom 1
     fi
-else 
-    set_mtd_part
-    set_rom_part
-    set_jffs_part
 fi