fix shellcheck warnings

dnsapi/dns_gd.sh

@@ -26,7 +26,7 @@ dns_gd_add() {
   _saveaccountconf GD_Secret "$GD_Secret"
 
   _debug "First detect the root zone"
-  if ! _get_root $fulldomain; then
+  if ! _get_root "$fulldomain"; then
     _err "invalid domain"
     return 1
   fi
@@ -67,8 +67,8 @@ _get_root() {
   domain=$1
   i=2
   p=1
-  while [ '1' ]; do
-    h=$(printf $domain | cut -d . -f $i-100)
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
     if [ -z "$h" ]; then
       #not valid
       return 1
@@ -78,11 +78,11 @@ _get_root() {
       return 1
     fi
 
-    if printf "$response" | grep '"code":"NOT_FOUND"' >/dev/null; then
+    if _contains "$response" '"code":"NOT_FOUND"'; then
       _debug "$h not found"
     else
-      _sub_domain=$(printf $domain | cut -d . -f 1-$p)
-      _domain=$h
+      _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+      _domain="$h"
       return 0
     fi
     p=$i
@@ -95,7 +95,7 @@ _gd_rest() {
   m=$1
   ep="$2"
   data="$3"
-  _debug $ep
+  _debug "$ep"
 
   _H1="Authorization: sso-key $GD_Key:$GD_Secret"
   _H2="Content-Type: application/json"