odhcp6c: use && in if statement on dynamic interfaces

It es recommended to use '&&' to improve readability on 'if' statement.

Signed-off-by: Florian Eckert <[email protected]>

package/network/ipv6/odhcp6c/files/dhcpv6.script

@@ -165,7 +165,7 @@ setup_interface () {
 
 	[ -n "$ZONE" ] || ZONE=$(fw3 -q network $INTERFACE 2>/dev/null)
 
-	if [ "$IFACE_MAP" != 0 -a -n "$MAPTYPE" -a -n "$MAPRULE" ]; then
+	if [ "$IFACE_MAP" != 0 ] && [ -n "$MAPTYPE" ] && [ -n "$MAPRULE" ]; then
 		[ -z "$IFACE_MAP" -o "$IFACE_MAP" = 1 ] && IFACE_MAP=${INTERFACE}_4
 		json_init
 		json_add_string name "$IFACE_MAP"
@@ -182,7 +182,7 @@ setup_interface () {
 		[ -n "$IFACE_MAP_DELEGATE" ] && json_add_boolean delegate "$IFACE_MAP_DELEGATE"
 		json_close_object
 		ubus call network add_dynamic "$(json_dump)"
-	elif [ -n "$AFTR" -a "$IFACE_DSLITE" != 0 -a -f /lib/netifd/proto/dslite.sh ]; then
+	elif [ -n "$AFTR" ] && [ "$IFACE_DSLITE" != 0 ] && [ -f /lib/netifd/proto/dslite.sh ]; then
 		[ -z "$IFACE_DSLITE" -o "$IFACE_DSLITE" = 1 ] && IFACE_DSLITE=${INTERFACE}_4
 		json_init
 		json_add_string name "$IFACE_DSLITE"
@@ -197,7 +197,7 @@ setup_interface () {
 		[ -n "$IFACE_DSLITE_DELEGATE" ] && json_add_boolean delegate "$IFACE_DSLITE_DELEGATE"
 		json_close_object
 		ubus call network add_dynamic "$(json_dump)"
-	elif [ "$IFACE_464XLAT" != 0 -a -f /lib/netifd/proto/464xlat.sh ]; then
+	elif [ "$IFACE_464XLAT" != 0 ] && [ -f /lib/netifd/proto/464xlat.sh ]; then
 		[ -z "$IFACE_464XLAT" -o "$IFACE_464XLAT" = 1 ] && IFACE_464XLAT=${INTERFACE}_4
 		json_init
 		json_add_string name "$IFACE_464XLAT"