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

@@ -6732,11 +6732,11 @@
 
 static void
 issue_cmd_ppc(struct mrsas_cmd *cmd, struct mrsas_instance *instance)
 {
         struct scsi_pkt *pkt;
-        atomic_add_16(&instance->fw_outstanding, 1);
+        atomic_inc_16(&instance->fw_outstanding);
 
         pkt = cmd->pkt;
         if (pkt) {
                 con_log(CL_DLEVEL1, (CE_NOTE, "%llx : issue_cmd_ppc:"
                     "ISSUED CMD TO FW : called : cmd:"