remove support for non-ANSI compilation

@@ -17,15 +17,14 @@
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
+ * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+ *
  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
  */
-/*
- * Copyright 2014 Garrett D'Amore <garrett@damore.org>
- */
 
 #ifndef _SYS_DDIDMAREQ_H
 #define _SYS_DDIDMAREQ_H
 
 #ifdef  __cplusplus

@@ -507,17 +506,12 @@
  *
  * If a DMA callback funtion is set to anything other than the following
  * defines then it is assumed that one wishes a callback and is providing
  * a function address.
  */
-#ifdef __STDC__
 #define DDI_DMA_DONTWAIT        ((int (*)(caddr_t))0)
 #define DDI_DMA_SLEEP           ((int (*)(caddr_t))1)
-#else
-#define DDI_DMA_DONTWAIT        ((int (*)())0)
-#define DDI_DMA_SLEEP           ((int (*)())1)
-#endif
 
 /*
  * Return values from callback functions.
  */
 #define DDI_DMA_CALLBACK_RUNOUT 0