Enable clang-tidy for clatd.

Enable the same warnings used elsewhere in the tree, and fix two
warnings it found (a safe use of strcpy, and a missing O_CLOEXEC
when opening the tun device node.

Test: builds, boots, clatd works
Test: m clatd clatd_test clatd_microbenchmark && atest clatd_test
Bug: 131268436
Change-Id: I9a5ea4de5f31d3c495871250a6493b07535a604b
Merged-In: I9a5ea4de5f31d3c495871250a6493b07535a604b
(cherry picked from commit 6a095dfa6bd2000f650308cdfa5a69e2635c02ec)

1 files changed, 1 insertions, 1 deletions

diff --git a/tun.h b/tun.h
index f0449b9..95650fa 100644
--- a/tun.h
+++ b/tun.h
@@ -30,7 +30,7 @@ struct tun_data {
 };
 
 int tun_open();
-int tun_alloc(char *dev, int fd);
+int tun_alloc(char *dev, int fd, size_t len);
 int send_tun(int fd, clat_packet out, int iov_len);
 int set_nonblocking(int fd);