Prefer VERIFY0P(n) over VERIFY(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/os/linux/spl/spl-kmem-cache.c

@@ -679,8 +679,8 @@ spl_kmem_cache_create(const char *name, size_t size, size_t align,
 	/*
 	 * Unsupported flags
 	 */
-	ASSERT(vmp == NULL);
-	ASSERT(reclaim == NULL);
+	ASSERT0P(vmp);
+	ASSERT0P(reclaim);
 
 	might_sleep();