include string.h to fix a compiler warning.
diff --git a/netstat.c b/netstat.c
index 5768599..9f96675 100644
--- a/netstat.c
+++ b/netstat.c
@@ -32,6 +32,7 @@
 #include <arpa/inet.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/socket.h>
 #include <sys/types.h>