Added else error condition to avert compiler warning.

Author: TimUnderhay

src/ngx_http_auth_jwt_module.c

@@ -175,6 +175,11 @@ static ngx_int_t ngx_http_auth_jwt_handler(ngx_http_request_t *r)
 		ngx_memcpy(keyBinary, jwtcf->auth_jwt_key.data, jwtcf->auth_jwt_key.len);
 		keylen = jwtcf->auth_jwt_key.len;
 	}
+	else
+	{
+		ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unsupported algorithm");
+		goto redirect;
+	}
 
 	// validate the jwt
 	jwtParseReturnCode = jwt_decode(&jwt, jwtCookieValChrPtr, keyBinary, keylen);