remap: don't free rpath and don't shfree_last gf

a) As we shmalloced rpath it can not be xfreed. b) As we shmalloc
variables in collect_remap_ghost() far away from open_remap_ghost()
where we want to free them, there is no guaranty that our shmalloc was
last and we can't use shfree_last().

fixes commit 0c675a5e ("files: remove link_remaps when everything
has been restored")

When create_ghost() fails for some reason that produces a segfault for me.
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/files-reg.c

@@ -466,8 +466,6 @@ close_ifd:
 err:
 	if (gfe)
 		ghost_file_entry__free_unpacked(gfe, NULL);
-	xfree(gf->remap.rpath);
-	shfree_last(gf);
 	return -1;
 }