[5.1]Fix bug swoole#5168 (swoole#5169)

* Fix bug swoole#5186

* Fix test

tests/swoole_http_server/bug_5186.phpt

@@ -0,0 +1,47 @@
+--TEST--
+swoole_http_server: 在使用hyperf3的时候遇到Context::parse_multipart_data()的提示
+--SKIPIF--
+<?php require __DIR__ . '/../include/skipif.inc'; ?>
+--FILE--
+<?php
+require __DIR__ . '/../include/bootstrap.php';
+
+use Swoole\Coroutine\Client;
+use Swoole\Http\Server;
+use Swoole\Http\Request;
+use Swoole\Http\Response;
+use function Swoole\Coroutine\run;
+
+$pm = new SwooleTest\ProcessManager;
+$pm->parentFunc = function () use ($pm) {
+    run(function () use ($pm) {
+        $content = "POST / HTTP/1.1\r\nHost: 127.0.0.1:{$pm->getFreePort()}\r\nConnection: keep-alive\r\nContent-Length: 44\r\nContent-Type: multipart/form-data; boundary=----WebKitFormBoundaryOldDnwBESVoBBtI5\r\nAccept-Encoding: gzip, deflate\r\n\r\n------WebKitFormBoundaryOldDnwBESVoBBtI5--\r\n\r\n";
+        $client = new Client(SWOOLE_SOCK_TCP);
+        $client->connect('127.0.0.1', $pm->getFreePort(), 0.5);
+        $client->send($content);
+        $client->close();
+    });
+    echo "DONE\n";
+    $pm->kill();
+};
+
+$pm->childFunc = function () use ($pm) {
+    $http = new Server('127.0.0.1', $pm->getFreePort(), SWOOLE_BASE);
+    $http->set([
+        'log_file' => '/dev/null',
+    ]);
+    $http->on('workerStart', function () use ($pm) {
+        $pm->wakeup();
+    });
+    $http->on('request', function (Request $request, Response $response) use ($http) {
+        var_dump($request->files);
+        $response->end('Hello World');
+    });
+    $http->start();
+};
+$pm->childFirst();
+$pm->run();
+?>
+--EXPECT--
+DONE
+NULL

thirdparty/multipart_parser.c

@@ -203,7 +203,10 @@ ssize_t multipart_parser_execute(multipart_parser *p, const char *buf, size_t le
         case s_start_boundary:
             multipart_log_c("s_start_boundary");
             if (p->index == p->boundary_length) {
-                if (c != CR) {
+                // https://github.com/swoole/swoole-src/issues/5168
+                if (c == '-') {
+                    p->state = s_part_data_final_hyphen;
+                } else if (c != CR) {
                     ERROR_EXPECT(MPPE_BOUNDARY_END_NO_CRLF, CR);
                 }
                 p->index++;