dev: Make device_mtu() return size_t

We don't return negative values and the MTU is supposed to be the
(maximum) length of a packet, thus make it of type size_t. Most of the
users in the code store it in size_t already anyway.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 1 deletions

diff --git a/dev.h b/dev.h
index 7bd1fb3..4bfc3f0 100644
--- a/dev.h
+++ b/dev.h
@@ -4,7 +4,7 @@
 #include <sys/socket.h>
 #include "built_in.h"
 
-extern int device_mtu(const char *ifname);
+extern size_t device_mtu(const char *ifname);
 extern int device_address(const char *ifname, int af, struct sockaddr_storage *ss);
 extern int device_ifindex(const char *ifname);
 extern int device_type(const char *ifname);