Standardize on the vi editing directives being on the first line.
diff --git a/networking/ipaddr.c b/networking/ipaddr.c
index 4317557..c907808 100644
--- a/networking/ipaddr.c
+++ b/networking/ipaddr.c
@@ -1,3 +1,4 @@
+/* vi: set sw=4 ts=4: */
 /*
  * ip.c		"ip" utility frontend.
  *