kobject: Add missing format attribute specifications

Several functions in <linux/kobject.h> accept printf-style arguments.
Some of these functions have been annotated with a format attribute
declaration while others have not been annotated. Add a format attribute
specification where it is missing.

Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/kobject.h

···
 extern void kobject_init(struct kobject *kobj, struct kobj_type *ktype);
 extern int __must_check kobject_add(struct kobject *kobj,
 				    struct kobject *parent,
-				    const char *fmt, ...);
+				    const char *fmt, ...)
+	__attribute__((format(printf, 3, 4)));
 extern int __must_check kobject_init_and_add(struct kobject *kobj,
 					     struct kobj_type *ktype,
 					     struct kobject *parent,
-					     const char *fmt, ...);
+					     const char *fmt, ...)
+	__attribute__((format(printf, 4, 5)));
 
 extern void kobject_del(struct kobject *kobj);
 
···
 
 static inline int add_uevent_var(struct kobj_uevent_env *env,
 				 const char *format, ...)
+	__attribute__((format(printf, 2, 3)))
 { return 0; }
 
 static inline int kobject_action_type(const char *buf, size_t count,