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

*** 1892,1902 ****
  
  void
  tbolt_issue_cmd(struct mrsas_cmd *cmd, struct mrsas_instance *instance)
  {
          MRSAS_REQUEST_DESCRIPTOR_UNION *req_desc = cmd->request_desc;
!         atomic_add_16(&instance->fw_outstanding, 1);
  
          struct scsi_pkt *pkt;
  
          con_log(CL_ANN1,
              (CE_NOTE, "tbolt_issue_cmd: cmd->[SMID]=0x%X", cmd->SMID));
--- 1892,1902 ----
  
  void
  tbolt_issue_cmd(struct mrsas_cmd *cmd, struct mrsas_instance *instance)
  {
          MRSAS_REQUEST_DESCRIPTOR_UNION *req_desc = cmd->request_desc;
!         atomic_inc_16(&instance->fw_outstanding);
  
          struct scsi_pkt *pkt;
  
          con_log(CL_ANN1,
              (CE_NOTE, "tbolt_issue_cmd: cmd->[SMID]=0x%X", cmd->SMID));