e1000: Update mc filter before RCTL flags

Update mc filter array before changing RCTL flags as in 5a3eb620

Approved by:	grehan

(cherry picked from commit 07ede751)

sys/dev/e1000/if_em.c

@@ -1723,6 +1723,9 @@ em_if_multi_set(if_ctx_t ctx)
 
 	if_multiaddr_array(ifp, mta, &mcnt, MAX_NUM_MULTICAST_ADDRESSES);
 
+	if (mcnt < MAX_NUM_MULTICAST_ADDRESSES)
+		e1000_update_mc_addr_list(&sc->hw, mta, mcnt);
+
 	reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);
 
 	if (if_getflags(ifp) & IFF_PROMISC)
@@ -1736,9 +1739,6 @@ em_if_multi_set(if_ctx_t ctx)
 
 	E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);
 
-	if (mcnt < MAX_NUM_MULTICAST_ADDRESSES)
-		e1000_update_mc_addr_list(&sc->hw, mta, mcnt);
-
 	if (sc->hw.mac.type == e1000_82542 &&
 	    sc->hw.revision_id == E1000_REVISION_2) {
 		reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);