rootfs_deb: fix parsing a shell cmd

This fixes [BUGID #360] parsing failure when using package_dep
as rootfs generator.

Signed-off-by: Saul Wold <Saul.Wold@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes/rootfs_deb.bbclass b/meta/classes/rootfs_deb.bbclass
index b33d153dae..ee7a1a3b59 100644
--- a/meta/classes/rootfs_deb.bbclass
+++ b/meta/classes/rootfs_deb.bbclass
@@ -36,7 +36,7 @@ fakeroot rootfs_deb_do_rootfs () {
                 echo "deb file:${DEPLOY_DIR_DEB}/$arch/ ./" >> ${STAGING_ETCDIR_NATIVE}/apt/sources.list.rev
                 (echo "Package: *"
                 echo "Pin: release l=$arch"
-                echo "Pin-Priority: $((800 + $priority))"
+                echo "Pin-Priority: $(expr 800 + $priority)"
                 echo) >> ${STAGING_ETCDIR_NATIVE}/apt/preferences
                 priority=$(expr $priority + 5)
         done