samples: mark {static|__init|__exit} for {init|exit} functions

None of these (init|exit) functions is called from other functions which
is outside the kernel module mechanism or kernel itself, so mark them as
{static|__init|__exit}.

Signed-off-by: Qinghuang Feng <qhfeng.kernel@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

samples/kobject/kobject-example.c

@@ -101,7 +101,7 @@ static struct attribute_group attr_group = {
 
 static struct kobject *example_kobj;
 
-static int example_init(void)
+static int __init example_init(void)
 {
 	int retval;
 
@@ -126,7 +126,7 @@ static int example_init(void)
 	return retval;
 }
 
-static void example_exit(void)
+static void __exit example_exit(void)
 {
 	kobject_put(example_kobj);
 }

samples/kobject/kset-example.c

@@ -229,7 +229,7 @@ static void destroy_foo_obj(struct foo_obj *foo)
 	kobject_put(&foo->kobj);
 }
 
-static int example_init(void)
+static int __init example_init(void)
 {
 	/*
 	 * Create a kset with the name of "kset_example",
@@ -264,7 +264,7 @@ foo_error:
 	return -EINVAL;
 }
 
-static void example_exit(void)
+static void __exit example_exit(void)
 {
 	destroy_foo_obj(baz_obj);
 	destroy_foo_obj(bar_obj);