mfd: qcom_rpm: 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.
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/qcom_rpm.c

@@ -589,6 +589,7 @@ static int qcom_rpm_probe(struct platform_device *pdev)
 	}
 
 	rpm->ipc_regmap = syscon_node_to_regmap(syscon_np);
+	of_node_put(syscon_np);
 	if (IS_ERR(rpm->ipc_regmap))
 		return PTR_ERR(rpm->ipc_regmap);