kernel-fitimage: fix handling of empty default dtb

Fix error in run.do_assemble_fitimage_initramfs.2779256:
             line 238: [: =: unary operator expected
if FIT_CONF_DEFAULT_DTB is empty.

(From OE-Core rev: 19a6eea0951404403dcb5d0deeda8558b1337f82)

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes-recipe/kernel-fitimage.bbclass b/meta/classes-recipe/kernel-fitimage.bbclass
index 4b74ddc201..6e6898e5f6 100644
--- a/meta/classes-recipe/kernel-fitimage.bbclass
+++ b/meta/classes-recipe/kernel-fitimage.bbclass
@@ -611,7 +611,7 @@ fitimage_assemble() {
                         fi
 
                         # Set the default dtb image if it exists in the devicetree.
-                        if [ ${FIT_CONF_DEFAULT_DTB} = $DTB ];then
+                        if [ "${FIT_CONF_DEFAULT_DTB}" = "$DTB" ];then
                                 default_dtb_image=$(echo "$DTB" | tr '/' '_')
                         fi