5045 use atomic_{inc,dec}_* instead of atomic_add_*

@@ -166,13 +166,13 @@
          * for comparison.
          */
         if (slc != NULL) {
                 int64_t now;
 
-                if (atomic_add_32_nv(&slc->slc_cnt, 1) > slc->slc_max + 1) {
+                if (atomic_inc_32_nv(&slc->slc_cnt) > slc->slc_max + 1) {
                         now = ddi_get_lbolt64();
-                        atomic_add_32(&slc->slc_cnt, -1);
+                        atomic_dec_32(&slc->slc_cnt);
                         SCTP_KSTAT(sctps, sctp_listen_cnt_drop);
                         slc->slc_drop++;
                         if (now - slc->slc_report_time >
                             MSEC_TO_TICK(SCTP_SLC_REPORT_INTERVAL)) {
                                 zcmn_err(connp->conn_zoneid, CE_WARN,

@@ -187,11 +187,11 @@
                 slc_set = B_TRUE;
         }
 
         if ((eager = sctp_create_eager(sctp)) == NULL) {
                 if (slc_set)
-                        atomic_add_32(&slc->slc_cnt, -1);
+                        atomic_dec_32(&slc->slc_cnt);
                 return (NULL);
         }
         econnp = eager->sctp_connp;
 
         if (connp->conn_policy != NULL) {