pki: Fix switch statement of pki_key_generate_ecdsa().

src/pki_crypto.c

@@ -411,8 +411,10 @@ int pki_key_generate_ecdsa(ssh_key key, int parameter) {
     switch (parameter) {
         case 384:
             nid = NID_secp384r1;
+            break;
         case 512:
             nid = NID_secp521r1;
+            break;
         case 256:
         default:
             nid = NID_X9_62_prime256v1;