udhcp: logging improvements, field and variable renames

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index 911bd3b..d53c02d 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -78,7 +78,7 @@
 		//, packet->cookie
 		//, packet->options[]
 	);
-	bin2hex(buf, (void *) packet->chaddr, sizeof(packet->chaddr));
+	*bin2hex(buf, (void *) packet->chaddr, sizeof(packet->chaddr)) = '\0';
 	bb_info_msg(" chaddr %s", buf);
 }
 #endif