fsnotify: Remove fsnotify_detach_group_marks()

The function is already mostly contained in what
fsnotify_clear_marks_by_group() does. Just update that function to not
select marks when all of them should be destroyed and remove
fsnotify_detach_group_marks().

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

include/linux/fsnotify_backend.h

@@ -208,6 +208,8 @@ struct fsnotify_mark_connector {
 	spinlock_t lock;
 #define FSNOTIFY_OBJ_TYPE_INODE		0x01
 #define FSNOTIFY_OBJ_TYPE_VFSMOUNT	0x02
+#define FSNOTIFY_OBJ_ALL_TYPES		(FSNOTIFY_OBJ_TYPE_INODE | \
+					 FSNOTIFY_OBJ_TYPE_VFSMOUNT)
 	unsigned int flags;	/* Type of object [lock] */
 	union {	/* Object pointer [lock] */
 		struct inode *inode;