cleanup - remove send_tun()

Test:
  git grep send_tun
  comes up empty

Bug: 144730808
Test: atest clatd_test netd_integration_test
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If81ca18bf5a33549b532de0d6406e32f4560c93a
diff --git a/translate.c b/translate.c
index 1632753..f759726 100644
--- a/translate.c
+++ b/translate.c
@@ -524,7 +524,7 @@
     if (iov_len > 0) {
       fill_tun_header(&tun_targ, ETH_P_IP);
       out[CLAT_POS_TUNHDR].iov_len = sizeof(tun_targ);
-      send_tun(fd, out, iov_len);
+      writev(fd, out, iov_len);
     }
   }
 }
diff --git a/tun.h b/tun.h
index eaeebc6..1dc9136 100644
--- a/tun.h
+++ b/tun.h
@@ -32,15 +32,4 @@
   struct packet_ring ring;
 };
 
-/* function: send_tun
- * sends a clat_packet to a tun interface
- * fd      - the tun filedescriptor
- * out     - the packet to send
- * iov_len - the number of entries in the clat_packet
- * returns: number of bytes read on success, -1 on failure
- */
-static inline int send_tun(int fd, clat_packet out, int iov_len) {
-  return writev(fd, out, iov_len);
-}
-
 #endif