Fixes the late_initcall signature, as reported by kbuildbot

Also rename the test function to be more consistent with other
in-kernel test-cases.

Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
---
 net/mptcp/crypto.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/crypto.c b/net/mptcp/crypto.c
index 68f1758b96c2..40d1bb18fd60 100644
--- a/net/mptcp/crypto.c
+++ b/net/mptcp/crypto.c
@@ -120,7 +120,7 @@ static struct test_cast tests[] = {
 	},
 };
 
-static void __init crypto_test(void)
+static int __init test_mptcp_crypto(void)
 {
 	char hmac[20], hmac_hex[41];
 	u32 nonce1, nonce2;
@@ -145,7 +145,8 @@ static void __init crypto_test(void)
 		else
 			pr_info("test %d [ ok ]", i);
 	}
+	return 0;
 }
 
-late_initcall(crypto_test);
+late_initcall(test_mptcp_crypto);
 #endif
-- 
2.21.0