The ASSERT() doesn't compile if ZFS debugging is enabled:

  CC tests/tst-zfs-disk.o
In file included from ../../bsd/sys/cddl/compat/opensolaris/sys/debug.h:35:0,
                 from ../../bsd/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_context.h:42,
                 from ../../tests/tst-zfs-disk.c:28:
../../tests/tst-zfs-disk.c: In function ‘make_vdev_root’:
../../tests/tst-zfs-disk.c:119:9: error: ‘t’ undeclared (first use in this function)
  ASSERT(t > 0);
         ^
../../bsd/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h:56:29: note: in definition of macro ‘ASSERT’
 #define ASSERT(EX) ((void)((EX) || assfail(#EX, __FILE__, __LINE__)))
                             ^
../../tests/tst-zfs-disk.c:119:9: note: each undeclared identifier is reported only once for each function it appears in
  ASSERT(t > 0);
         ^
../../bsd/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h:56:29: note: in definition of macro ‘ASSERT’
 #define ASSERT(EX) ((void)((EX) || assfail(#EX, __FILE__, __LINE__)))
                             ^