nss-resolve: remove dead code

ifindex < 0 was already checked before entering the loop

Found by coverity. Fixes: CID#1237609

src/nss-resolve/nss-resolve.c

@@ -466,11 +466,6 @@ enum nss_status _nss_resolve_gethostbyname3_r(
                         goto fail;
                 }
 
-                if (ifindex < 0) {
-                        r = -EINVAL;
-                        goto fail;
-                }
-
                 memcpy(r_addr + i*ALIGN(alen), a, alen);
                 i++;
         }