Moved vnum to priv_data of vm_file since its only related to vfs files.

tasks/mm0/include/file.h

@@ -17,5 +17,6 @@ int sys_read(l4id_t sender, int fd, void *buf, int count);
 int sys_write(l4id_t sender, int fd, void *buf, int count);
 int sys_lseek(l4id_t sender, int fd, off_t offset, int whence);
 
+#define vm_file_to_vnum(f)	(*(unsigned long *)((f)->priv_data))
 extern struct list_head vm_file_list;
 #endif /* __MM0_FILE_H__ */

tasks/mm0/include/vm_area.h

@@ -130,7 +130,6 @@ struct vm_object {
 
 /* In memory representation of either a vfs file, a device. */
 struct vm_file {
-	unsigned long vnum;
 	unsigned long length;
 	unsigned int type;
 	struct list_head list;