pre-dump: don't allow --lazy-pages option

Using --lazy-pages with pre-dump causes partial memory dump and it's not
the intention. The whole point of pre-dump is to keep amount of memory that
would be dumped during tasks freeze to minimum.

Disallow running pre-dump with --lazy-pages.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

criu/crtools.c

@@ -238,6 +238,11 @@ int main(int argc, char *argv[], char *envp[])
 		if (!opts.tree_id)
 			goto opt_pid_missing;
 
+		if (opts.lazy_pages) {
+			pr_err("Cannot pre-dump with --lazy-pages\n");
+			return 1;
+		}
+
 		return cr_pre_dump_tasks(opts.tree_id) != 0;
 	}