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

*** 1980,1990 ****
           * detect this condition within one second of each other, so
           * when deadman_enabled is off, deadman_panics will
           * typically be a multiple of the total number of CPUs in
           * the system.
           */
!         atomic_add_32(&deadman_panics, 1);
  
          if (!deadman_enabled) {
                  CPU->cpu_deadman_countdown = deadman_seconds;
                  return;
          }
--- 1980,1990 ----
           * detect this condition within one second of each other, so
           * when deadman_enabled is off, deadman_panics will
           * typically be a multiple of the total number of CPUs in
           * the system.
           */
!         atomic_inc_32(&deadman_panics);
  
          if (!deadman_enabled) {
                  CPU->cpu_deadman_countdown = deadman_seconds;
                  return;
          }