i2c: mux: pinctrl: potential NULL dereference on error

If i2c_mux_alloc() fails then we'd have a NULL dereference here.

Fixes: c4aee3e1b0 ("i2c: mux: pinctrl: remove platform_data")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Rosin <peda@axentia.se>

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

@@ -173,7 +173,7 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
 err_del_adapter:
 	i2c_mux_del_adapters(muxc);
 err_put_parent:
-	i2c_put_adapter(muxc->parent);
+	i2c_put_adapter(parent);
 
 	return ret;
 }