pstree: Export current

Export current to allow to use find_unused_fd()
from everywhere.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-restore.c

@@ -108,7 +108,7 @@
 #define arch_export_unmap		__export_unmap
 #endif
 
-static struct pstree_item *current;
+struct pstree_item *current;
 
 static int restore_task_with_children(void *);
 static int sigreturn_restore(pid_t pid, struct task_restore_args *ta, unsigned long alen, CoreEntry *core);

criu/include/pstree.h

@@ -26,6 +26,8 @@ struct pstree_item {
 	TaskKobjIdsEntry	*ids;
 };
 
+struct pstree_item *current;
+
 struct rst_info;
 /* See alloc_pstree_item() for details */
 static inline struct rst_info *rsti(struct pstree_item *i)