meta-quanta: fix shellcheck issues

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I189baf142cc86d44ebbf615edd3bb0ec1785be8d
diff --git a/meta-quanta/meta-gbs/recipes-gbs/gbs-bmc-update/files/bmc-verify.sh b/meta-quanta/meta-gbs/recipes-gbs/gbs-bmc-update/files/bmc-verify.sh
index bbaf15d..d45105d 100644
--- a/meta-quanta/meta-gbs/recipes-gbs/gbs-bmc-update/files/bmc-verify.sh
+++ b/meta-quanta/meta-gbs/recipes-gbs/gbs-bmc-update/files/bmc-verify.sh
@@ -9,7 +9,7 @@
 if [ -f $publickey ];then
     r="$(openssl dgst -verify $publickey -sha256 -signature $sigfile $bmcimage)"
     echo "$r" > $bmclog
-    if [[ "Verified OK" == "$r" ]]; then
+    if [ "Verified OK" = "$r" ]; then
         mv $bmcimage $imagebmc
         rm -f $sigfile
         exit 0