greybus: module: fix double freeing of module structure

The module will be released by gb_module_release() once all references
for the module are dropped. And so there is no need to free it in the
error path specially.
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/module.c

@@ -151,7 +151,6 @@ struct gb_module *gb_module_create(struct device *parent, u8 module_id)
 		pr_err("failed to add module device for id 0x%02hhx\n",
 			module_id);
 		put_device(&module->dev);
-		kfree(module);
 		return NULL;
 	}