chardev: Simplify usage of try_module_get()

try_module_get(NULL) is true, so there is no need to check owner being
NULL.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christian Brauner <[e-mail]>

fs/char_dev.c

···
 	struct module *owner = p->owner;
 	struct kobject *kobj;
 
-	if (owner && !try_module_get(owner))
+	if (!try_module_get(owner))
 		return NULL;
 	kobj = kobject_get_unless_zero(&p->kobj);
 	if (!kobj)