iftop: fix mac address display

iftop would display portions of mac address with large ffffff prefixes.
Make if_hw_addr type consistent.

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
---
 addrs_dlpi.c  | 2 +-
 addrs_ioctl.c | 2 +-
 addrs_ioctl.h | 2 +-
 iftop.c       | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/addrs_dlpi.c b/addrs_dlpi.c
index 188fef8..6c04ea1 100644
--- a/addrs_dlpi.c
+++ b/addrs_dlpi.c
@@ -50,7 +50,7 @@ extern char *strncat2(char *dest, char *src, int n);
  */
 
 int
-get_addrs_dlpi(char *interface, char if_hw_addr[], struct in_addr *if_ip_addr)
+get_addrs_dlpi(char *interface, u_int8_t if_hw_addr[], struct in_addr *if_ip_addr)
 {
   int got_hw_addr = 0;
   int got_ip_addr = 0;
diff --git a/addrs_ioctl.c b/addrs_ioctl.c
index 870c83b..7d01fb2 100644
--- a/addrs_ioctl.c
+++ b/addrs_ioctl.c
@@ -45,7 +45,7 @@
  */
 
 int
-get_addrs_ioctl(char *interface, char if_hw_addr[], struct in_addr *if_ip_addr, struct in6_addr *if_ip6_addr)
+get_addrs_ioctl(char *interface, u_int8_t if_hw_addr[], struct in_addr *if_ip_addr, struct in6_addr *if_ip6_addr)
 {
   int s;
   struct ifreq ifr = {};
diff --git a/addrs_ioctl.h b/addrs_ioctl.h
index f93a0b4..739de61 100644
--- a/addrs_ioctl.h
+++ b/addrs_ioctl.h
@@ -7,6 +7,6 @@
 #define __ADDRS_IOCTL_H_
 
 int
-get_addrs_ioctl(char *interface, char if_hw_addr[], struct in_addr *if_ip_addr, struct in6_addr *if_ip6_addr);
+get_addrs_ioctl(char *interface, u_int8_t if_hw_addr[], struct in_addr *if_ip_addr, struct in6_addr *if_ip6_addr);
 
 #endif /* __ADDRS_IOCTL_H_ */
diff --git a/iftop.c b/iftop.c
index a090dcf..f1b371a 100644
--- a/iftop.c
+++ b/iftop.c
@@ -55,7 +55,7 @@
 
 /* ethernet address of interface. */
 int have_hw_addr = 0;
-char if_hw_addr[6];    
+u_int8_t if_hw_addr[6];    
 
 /* IP address of interface */
 int have_ip_addr = 0;
-- 
1.9.1