Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #17591

module/zfs/dsl_crypt.c

@@ -1912,7 +1912,7 @@ dsl_dataset_create_crypt_sync(uint64_t dsobj, dsl_dir_t *dd,
 
 	/* clones always use their origin's wrapping key */
 	if (dsl_dir_is_clone(dd)) {
-		ASSERT3P(dcp, ==, NULL);
+		ASSERT0P(dcp);
 
 		/*
 		 * If this is an encrypted clone we just need to clone the