4674 No need to undefine rptr in ip.c

@@ -12118,11 +12118,10 @@
                 mp1->b_band = priority;
                 ((dl_unitdata_req_t *)(mp1->b_rptr))->dl_priority.dl_max =
                     priority;
         }
         return (mp1);
-#undef rptr
 }
 
 /*
  * Finish the outbound IPsec processing. This function is called from
  * ipsec_out_process() if the IPsec packet was processed