i2c: muxes: fix leaked i2c adapter device node references

Every call of of_parse_phandle() increments user count of found device
node, if OF_DYNAMIC is enabled.

The change fixes all similar addressed cases in drivers/i2c.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/muxes/i2c-arb-gpio-challenge.c

@@ -197,6 +197,7 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 	arb->parent = of_get_i2c_adapter_by_node(parent_np);
+	of_node_put(parent_np);
 	if (!arb->parent) {
 		dev_err(dev, "Cannot find parent bus\n");
 		return -EPROBE_DEFER;

drivers/i2c/muxes/i2c-mux-gpio.c

@@ -76,6 +76,7 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
 		return -ENODEV;
 	}
 	adapter = of_find_i2c_adapter_by_node(adapter_np);
+	of_node_put(adapter_np);
 	if (!adapter)
 		return -EPROBE_DEFER;
 

drivers/i2c/muxes/i2c-mux-pinctrl.c

@@ -111,6 +111,7 @@ static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
 		return -ENODEV;
 	}
 	adapter = of_find_i2c_adapter_by_node(adapter_np);
+	of_node_put(adapter_np);
 	if (!adapter) {
 		dev_err(mux->dev, "Cannot find parent bus\n");
 		return -EPROBE_DEFER;

drivers/i2c/muxes/i2c-mux-reg.c

@@ -106,6 +106,7 @@ static int i2c_mux_reg_probe_dt(struct regmux *mux,
 		return -ENODEV;
 	}
 	adapter = of_find_i2c_adapter_by_node(adapter_np);
+	of_node_put(adapter_np);
 	if (!adapter)
 		return -EPROBE_DEFER;