mctp: test: zero out sockaddr

MCTP now requires that padding bytes are zero.
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Fixes: 1e4b50f0 ("mctp: handle the struct sockaddr_mctp padding fields")
Link: https://lore.kernel.org/r/20220110021806.2343023-1-matt@codeconstruct.com.auSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/mctp/test/route-test.c

@@ -285,7 +285,7 @@ static void __mctp_route_test_init(struct kunit *test,
 				   struct mctp_test_route **rtp,
 				   struct socket **sockp)
 {
-	struct sockaddr_mctp addr;
+	struct sockaddr_mctp addr = {0};
 	struct mctp_test_route *rt;
 	struct mctp_test_dev *dev;
 	struct socket *sock;