Fix typo.

This commit was SVN r13277.

opal/util/if.c

@@ -248,7 +248,7 @@ static int opal_ifinit(void)
         }
         if ((ifr->ifr_flags & IFF_UP) == 0) 
             continue;
-#ifdef IFF_SlAVE
+#ifdef IFF_SLAVE
         /* Is this a slave to a load balancer or bonded channel?
            If so, don't use it -- pick up the master instead */
         if ((ifr->ifr_flags & IFF_SLAVE) != 0)