Correct syntactical weirdness in a call to /etc/rc.d/dhclient. Fixes:

PR:		bin/75786
Reported by:	Radko Keves <rado at daemon dot sk>
Approved by:	murray
MFC After:	5 days	( to RELENG_5 )

etc/pccard_ether

@@ -70,7 +70,7 @@ stop_dhcp() {
 	case ${startstop} in
 	[Ss][Tt][Oo][Pp])
 		if [ -z "${_nlist}" ]; then
-			sh `/etc/rc.d/dhclient start`
+			sh /etc/rc.d/dhclient stop
 		else
 			start_dhcp_keep_current
 		fi