Revert "Switch ztest mmap(2) ASSERTs to VERIFYs"
This reverts commit 202619623022722f30c2ee49931a4fa6896421c7.
It is no longer necessary now that we pass -DDEBUG unconditionally.
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #4095