sunrpc: Fix RFC6803 encryption test

The usage_data[] array in rfc6803_encrypt_case() is uninitialised, so clear
it as it may cause the tests to fail otherwise.

Fixes: b958cff ("SUNRPC: Add encryption KUnit tests for the RFC 6803 encryption types")
Link: https://lore.kernel.org/r/[email protected]/
Signed-off-by: David Howells <[email protected]>
cc: Chuck Lever <[email protected]>
cc: Scott Mayhew <[email protected]>
cc: Herbert Xu <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: Chuck Lever <[email protected]>

Author: dhowells

net/sunrpc/auth_gss/gss_krb5_test.c

@@ -1327,6 +1327,7 @@ static void rfc6803_encrypt_case(struct kunit *test)
 	if (!gk5e)
 		kunit_skip(test, "Encryption type is not available");
 
+	memset(usage_data, 0, sizeof(usage_data));
 	usage.data[3] = param->constant;
 
 	Ke.len = gk5e->Ke_length;