meta-bytedance: me-time-sync: fix shellcheck issues

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I49f7334245394be03e77cb455d9e4d461fdb5705
diff --git a/meta-bytedance/meta-g220a/recipes-phosphor/datetime/me-time-sync/me-time-sync.sh b/meta-bytedance/meta-g220a/recipes-phosphor/datetime/me-time-sync/me-time-sync.sh
index 833b97d..f57de01 100644
--- a/meta-bytedance/meta-g220a/recipes-phosphor/datetime/me-time-sync/me-time-sync.sh
+++ b/meta-bytedance/meta-g220a/recipes-phosphor/datetime/me-time-sync/me-time-sync.sh
@@ -15,11 +15,11 @@
   exit 1
 fi
 
-t0=$((${a[7]}))
-t1=$((${a[8]}*256))
-t2=$((${a[9]}*256*256))
-t3=$((${a[10]}*256*256*256))
-t=$((${t0}+${t1}+${t2}+${t3}))
+t0=$((a[7]))
+t1=$((a[8]*256))
+t2=$((a[9]*256*256))
+t3=$((a[10]*256*256*256))
+t=$((t0+t1+t2+t3))
 echo "Setting date to ${t}"
 
 date -s @${t}