hwspinlock: qcom_hwspinlock: add missing of_node_put after calling of_parse_phandle

of_node_put needs to be called when the device node which is got
from of_parse_phandle has finished using.

Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/hwspinlock/qcom_hwspinlock.c

@@ -98,6 +98,7 @@ static int qcom_hwspinlock_probe(struct platform_device *pdev)
 	}
 
 	regmap = syscon_node_to_regmap(syscon);
+	of_node_put(syscon);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);