tests: fix warnings

While I don't see -Werror being used on tests anytime soon, there's no
reason to keep the warnings in tests unfixed.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/tests/ecommunity_test.c b/tests/ecommunity_test.c
index cd1681d..f12aa71 100644
--- a/tests/ecommunity_test.c
+++ b/tests/ecommunity_test.c
@@ -132,7 +132,7 @@
   
   printf ("%s: %s\n", t->name, t->desc);
 
-  ecom = ecommunity_parse (t->data, t->len);
+  ecom = ecommunity_parse ((u_int8_t *)t->data, t->len);
 
   printf ("ecom: %s\nvalidating...:\n", ecommunity_str (ecom));