Zero-initialize policy struct in test.
diff --git a/test/srtp_driver.c b/test/srtp_driver.c
index ccb0558..32f1b70 100644
--- a/test/srtp_driver.c
+++ b/test/srtp_driver.c
@@ -2046,6 +2046,7 @@
   srtp_t srtp_snd, srtp_recv;
   srtp_policy_t policy;
 
+  memset(&policy, 0, sizeof(policy));
   srtp_crypto_policy_set_rtp_default(&policy.rtp);
   srtp_crypto_policy_set_rtcp_default(&policy.rtcp);
   policy.ekt = NULL;