zdtm: open a file in mountpoints.c

We need to check that opened files can be restored in mntns
[xemul: s/slabinfo/meminfo as in 9dc050fd]
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/mountpoints.c

@@ -16,6 +16,7 @@ static char buf[1024];
 static int test_fn(int argc, char **argv)
 {
 	FILE *f;
+	int fd;
 	unsigned fs_cnt, fs_cnt_last = 0;
 
 again:
@@ -78,6 +79,10 @@ done:
 		return 1;
 	}
 
+	fd = open(MPTS_ROOT"/kernel/meminfo", O_RDONLY);
+	if (fd == -1)
+		return 1;
+
 	test_daemon();
 	test_waitsig();