Clean up use of zfs_log_create in zfs_dir

zfs_log_create returns void, so there is no reason to cast its return
value to void at the call site.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11994

module/os/freebsd/zfs/zfs_dir.c

@@ -849,8 +849,8 @@ zfs_make_xattrdir(znode_t *zp, vattr_t *vap, znode_t **xvpp, cred_t *cr)
 	VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
 	    sizeof (xzp->z_id), tx));
 
-	(void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
-	    xzp, "", NULL, acl_ids.z_fuidp, vap);
+	zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, xzp, "", NULL,
+	    acl_ids.z_fuidp, vap);
 
 	zfs_acl_ids_free(&acl_ids);
 	dmu_tx_commit(tx);

module/os/linux/zfs/zfs_dir.c

@@ -1106,8 +1106,8 @@ zfs_make_xattrdir(znode_t *zp, vattr_t *vap, znode_t **xzpp, cred_t *cr)
 	    sizeof (xzp->z_id), tx));
 
 	if (!zp->z_unlinked)
-		(void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
-		    xzp, "", NULL, acl_ids.z_fuidp, vap);
+		zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, xzp, "", NULL,
+		    acl_ids.z_fuidp, vap);
 
 	zfs_acl_ids_free(&acl_ids);
 	dmu_tx_commit(tx);