net/bonding: Fix which interface IPs get added to.

The previous bonding change of ensuring interfaces were down to add
slave interfaces, but it clobbered the IFACE variable, because it was
being passed to a bash function rather than a command.

X-Gentoo-Bug: 400613
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=400613
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

net/bonding.sh

@@ -102,15 +102,21 @@ bonding_pre_start()
 	eoutdent
 	if [ -d /sys/class/net ]; then
 		sys_bonding_path=/sys/class/net/"${IFACE}"/bonding
+		local oiface
+		oiface=$IFACE
 		if [ -n "${primary}" ]; then
-			IFACE=$primary _down
+			IFACE=$primary 
+			_down
+			IFACE=$oiface
 			echo "+${primary}" >$sys_bonding_path/slaves
 			echo "${primary}" >$sys_bonding_path/primary
 		fi
 		for s in ${slaves}; do
 			[ "${s}" = "${primary}" ] && continue
 			if ! grep -q ${s} $sys_bonding_path/slaves; then
-				IFACE=$s _down
+				IFACE=$s 
+				_down
+				IFACE=$oiface
 				echo "+${s}" >$sys_bonding_path/slaves
 			fi
 		done