can: grcan: grcan_probe(): remove extra of_node_get()

In grcan_probe(), of_find_node_by_path() has already increased the
refcount. There is no need to call of_node_get() again, so remove it.

Link: https://lore.kernel.org/all/20220619070257.4067022-1-windhl@126.com
Fixes: 1e93ed2 ("can: grcan: grcan_probe(): fix broken system id check for errata workaround needs")
Cc: stable@vger.kernel.org # v5.18
Cc: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: windhl

drivers/net/can/grcan.c

@@ -1646,7 +1646,6 @@ static int grcan_probe(struct platform_device *ofdev)
 	 */
 	sysid_parent = of_find_node_by_path("/ambapp0");
 	if (sysid_parent) {
-		of_node_get(sysid_parent);
 		err = of_property_read_u32(sysid_parent, "systemid", &sysid);
 		if (!err && ((sysid & GRLIB_VERSION_MASK) >=
 			     GRCAN_TXBUG_SAFE_GRLIB_VERSION))