X.509: Need to export x509_request_asymmetric_key()

Need to export x509_request_asymmetric_key() so that PKCS#7 can use it if
compiled as a module.
Reported-by: James Morris <jmorris@namei.org>
Signed-off-by: David Howells <dhowells@redhat.com>

crypto/asymmetric_keys/x509_public_key.c

@@ -96,6 +96,7 @@ struct key *x509_request_asymmetric_key(struct key *keyring,
 		 key_serial(key_ref_to_ptr(key)));
 	return key_ref_to_ptr(key);
 }
+EXPORT_SYMBOL_GPL(x509_request_asymmetric_key);
 
 /*
  * Set up the signature parameters in an X.509 certificate.  This involves