Cleanup DB_DNODE() macros usage

- Use the macros in few places it was missed.
 - Reduce scope of DB_DNODE_ENTER/EXIT() and inline some DB_DNODE()
uses to make it more obvious what exactly is protected there and
make unprotected accesses by mistake more difficult.
 - Make use of zrl_owner().

Reviewed-by: Rob Wing <rob.wing@klarasystems.com
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #16374

module/zfs/dnode.c

@@ -1757,7 +1757,7 @@ dnode_rele_and_unlock(dnode_t *dn, const void *tag, boolean_t evicting)
 	 * handle.
 	 */
 #ifdef ZFS_DEBUG
-	ASSERT(refs > 0 || dnh->dnh_zrlock.zr_owner != curthread);
+	ASSERT(refs > 0 || zrl_owner(&dnh->dnh_zrlock) != curthread);
 #endif
 
 	/* NOTE: the DNODE_DNODE does not have a dn_dbuf */