ddns-scripts: fix issue (#337) current/registered ip never match

new extraction of IP inside function get_registered_ip for host and nslookup
thanks to jow for the sed

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_functions.sh

@@ -672,7 +672,7 @@ get_registered_ip() {
 		} || {
 			# we need to run twice because multi-line output needs to be directly piped to grep because
 			# pipe returns return code of last prog in pipe but we need errors from host command
-			__IP=$(eval $__RUNPROG | grep "^$domain" | grep -m 1 -o "$__REGEX")
+			__IP=$(eval $__RUNPROG | awk -F "address " '/has/ {print $2; exit}' )
 		}
 
 	elif [ -x /usr/bin/nslookup ]; then	# last use BusyBox nslookup
@@ -692,7 +692,7 @@ get_registered_ip() {
 		} || {
 			# we need to run twice because multi-line output needs to be directly piped to grep because
 			# pipe returns return code of last prog in pipe but we need errors from nslookup command
-			__IP=$(eval $__RUNPROG | sed '1,2d' | grep -o "Name:\|Address.*" | grep -m 1 -o "$__REGEX")
+			__IP=$(eval $__RUNPROG | sed -ne "3,\$ { s/^Address [0-9]*: \($__REGEX\).*$/\\1/p }" )
 		}
 
 	else					# there must be an error