3752 want more verifiable dbuf user eviction
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Submitted by:   Will Andrews <willa@spectralogic.com>

@@ -24,10 +24,13 @@
  */
 
 #ifndef _SYS_ZFS_IOCTL_H
 #define _SYS_ZFS_IOCTL_H
 
+#ifndef _KERNEL
+#include <stddef.h>
+#endif
 #include <sys/cred.h>
 #include <sys/dmu.h>
 #include <sys/zio.h>
 #include <sys/dsl_deleg.h>
 #include <sys/spa.h>