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

@@ -3130,11 +3130,11 @@
         mutex_enter(&tx->lock);
 
         /* check to see if the slots are really there */
         avail = tx->mask - (tx->req - tx->done);
         if (unlikely(avail <=  MYRI10GE_MAX_SEND_DESC_TSO)) {
-                atomic_add_32(&tx->stall, 1);
+                atomic_inc_32(&tx->stall);
                 mutex_exit(&tx->lock);
                 return (EBUSY);
         }
 
         /* copy */

@@ -3371,11 +3371,11 @@
          * message to fit.
          */
 
         if (avail < max_segs) {
                 err = EBUSY;
-                atomic_add_32(&tx->stall_early, 1);
+                atomic_inc_32(&tx->stall_early);
                 goto stall;
         }
 
         /* find out how long the frame is and how many segments it is */
         count = 0;

@@ -3636,11 +3636,11 @@
         mutex_exit(&tx->lock);
         return (DDI_SUCCESS);
 
 late_stall:
         try_pullup = 0;
-        atomic_add_32(&tx->stall_late, 1);
+        atomic_inc_32(&tx->stall_late);
 
 abort_with_handles:
         /* unbind and free handles from previous mblks */
         for (i = 0; i < count; i++) {
                 bp = tx_info[i].m;

@@ -3669,11 +3669,11 @@
         }
 
 stall:
         if (err != 0) {
                 if (err == EBUSY) {
-                        atomic_add_32(&tx->stall, 1);
+                        atomic_inc_32(&tx->stall);
                 } else {
                         MYRI10GE_ATOMIC_SLICE_STAT_INC(xmit_err);
                 }
         }
         return (err);