restore: Pass shmems_fd as argument as well

We might be needing to close the shmems file descriptor.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

cr-restore.c

@@ -371,7 +371,7 @@ static int shmem_remap(pid_t pid, struct shmems *old_addr,
 	if (new_addr->nr_shmems != old_addr->nr_shmems)
 		pr_err("shmem_remap failed\n");
 
-	return 0;
+	return fd;
 }
 
 static int prepare_shared(int ps_fd)
@@ -1616,7 +1616,7 @@ static void sigreturn_restore(pid_t pstree_pid, pid_t pid)
 				       restore_task_vma_len +
 				       restore_thread_vma_len);
 	ret = shmem_remap(shmems->pid, shmems, shmems_ref);
-	if (ret)
+	if (ret < 0)
 		goto err;
 
 	/*
@@ -1626,6 +1626,7 @@ static void sigreturn_restore(pid_t pstree_pid, pid_t pid)
 	task_args->shmems	= shmems_ref;
 	task_args->fd_core	= fd_core;
 	task_args->fd_self_vmas	= fd_self_vmas;
+	task_args->shmems_fd	= ret;
 	strncpy(task_args->self_vmas_path,
 		self_vmas_path,
 		sizeof(task_args->self_vmas_path));

include/restorer.h

@@ -78,6 +78,7 @@ struct task_restore_core_args {
 	thread_restore_fcall_t		clone_restore_fn;	/* helper address for clone() call */
 	struct thread_restore_args	*thread_args;		/* array of thread arguments */
 	struct shmems			*shmems;
+	int				shmems_fd;
 } __aligned(sizeof(long));
 
 struct pt_regs {