remove stray semicolons (by Cristian Ionescu-Idbohrn)

diff --git a/networking/interface.c b/networking/interface.c
index f5c94f1..ee8ab10 100644
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -223,7 +223,7 @@
 	char *pos;
 	unsigned int i;
 
-	if (!buff);
+	if (!buff)
 		buff = xmalloc(sizeof(struct sockaddr) * 3 + 1);
 	pos = buff;
 	for (i = 0; i < sizeof(struct sockaddr); i++) {