kernel/image: Switch to using DoublyLinkedList<> for struct image.

No functional change intended.

headers/private/kernel/kimage.h

@@ -5,6 +5,7 @@
 #ifndef _KERNEL_IMAGE_H
 #define _KERNEL_IMAGE_H
 
+
 #include <image.h>
 
 #include <image_defs.h>
@@ -21,11 +22,10 @@ using BKernel::Team;
 
 #ifdef __cplusplus
 
+#include <util/DoublyLinkedList.h>
 #include <util/OpenHashTable.h>
 
-struct image {
-	struct image*			next;
-	struct image*			prev;
+struct image : public DoublyLinkedListLinkImpl<struct image> {
 	struct image*			hash_link;
 	extended_image_info		info;
 	team_id					team;

headers/private/kernel/thread_types.h

@@ -260,7 +260,7 @@ struct Team : TeamThreadIteratorEntry<team_id>, KernelReferenceable,
 	Thread			*thread_list;	// protected by fLock, signal_lock and
 									// gThreadCreationLock
 	struct team_loading_info *loading_info;	// protected by fLock
-	struct list		image_list;		// protected by sImageMutex
+	DoublyLinkedList<image> image_list; // protected by sImageMutex
 	struct list		watcher_list;
 	struct list		sem_list;		// protected by sSemsSpinlock
 	struct list		port_list;		// protected by sPortsLock