page-read: Only the top-most can be remote

All the "lower" page-read-s should have already arrived with
pre-dump. This fixes the combined scheme.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

criu/pagemap.c

@@ -699,6 +699,11 @@ int open_page_read_at(int dfd, int pid, struct page_read *pr, int pr_flags)
 	static unsigned ids = 1;
 	bool remote = pr_flags & PR_REMOTE;
 
+	/*
+	 * Only the top-most page-read can be remote, all the
+	 * others are always local.
+	 */
+	pr_flags &= ~PR_REMOTE;
 	if (opts.auto_dedup)
 		pr_flags |= PR_MOD;
 	if (pr_flags & PR_MOD)