cros_workon: fix bug where cros_workon start doesn't work for first start

cros_workon

Index: cros_workon
diff --git a/cros_workon b/cros_workon
index 22b375201d2fdade02095fe846ecc7f7256c377d..d71879f9304f46590695a8acfa78ea5205420dca 100755
--- a/cros_workon
+++ b/cros_workon
@@ -155,9 +155,9 @@ find_repo_dir () {
 regen_manifest_and_sync() {
   for pkgname in $(show_live_ebuilds); do
     eval $(${EBUILDCMD} $(${EQUERYCMD} which ${pkgname}) info)
-    local srcdir=$(readlink -f ${CROS_WORKON_SRCDIR})
-    local trunkdir=$(readlink -f ${CHROOT_TRUNK_DIR})
-    local project_path=${srcdir#$(readlink -f ${CHROOT_TRUNK_DIR})/}
+    local srcdir=$(readlink -m ${CROS_WORKON_SRCDIR})
+    local trunkdir=$(readlink -m ${CHROOT_TRUNK_DIR})
+    local project_path=${srcdir#${trunkdir}/}
 
     loman add --workon "${CROS_WORKON_PROJECT}" "${project_path}"
   done