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 <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/qcom_rpm.c

···
 	}
 
 	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);