Fix psalm errors

Author: kelunik

examples/datagram.php

@@ -13,6 +13,7 @@
 
     echo "Datagram active on {$datagram->getAddress()}" . PHP_EOL;
 
+    /** @psalm-suppress PossiblyNullArrayAccess */
     while ([$address, $data] = yield $datagram->receive()) {
         $message = \sprintf("Received '%s' from %s\n", \trim($data), (string) $address);
         $datagram->send($address, $message);

src/EncryptableSocket.php

@@ -15,7 +15,7 @@ interface EncryptableSocket extends Socket
     /**
      * @param CancellationToken|null $cancellationToken
      *
-     * @return Promise<null> Resolved when TLS is successfully set up on the socket.
+     * @return Promise<void> Resolved when TLS is successfully set up on the socket.
      *
      * @throws SocketException Promise fails and the socket is closed if setting up TLS fails.
      */
@@ -24,7 +24,7 @@ public function setupTls(?CancellationToken $cancellationToken = null): Promise;
     /**
      * @param CancellationToken|null $cancellationToken
      *
-     * @return Promise<null> Resolved when TLS is successfully shutdown.
+     * @return Promise<void> Resolved when TLS is successfully shutdown.
      *
      * @throws SocketException Promise fails and the socket is closed if shutting down TLS fails.
      */

src/Internal/functions.php

@@ -72,7 +72,7 @@ function parseUri(string $uri): array
  * @param array             $options
  * @param CancellationToken $cancellationToken
  *
- * @return Promise
+ * @return Promise<void>
  *
  * @internal
  */
@@ -90,7 +90,8 @@ function setupTls($socket, array $options, ?CancellationToken $cancellationToken
 
     // Yes, that function can return true / false / 0, don't use weak comparisons.
     if ($result === true) {
-        return new Success($socket);
+        /** @psalm-suppress InvalidReturnStatement */
+        return new Success;
     }
 
     if ($result === false) {
@@ -142,16 +143,18 @@ function setupTls($socket, array $options, ?CancellationToken $cancellationToken
  *
  * @param resource $socket
  *
- * @return Promise
+ * @return Promise<void>
  *
  * @internal
+ * @psalm-suppress InvalidReturnType
  */
 function shutdownTls($socket): Promise
 {
     // note that disabling crypto *ALWAYS* returns false, immediately
     // don't set _enabled to false, TLS can be setup only once
     @\stream_socket_enable_crypto($socket, false);
 
+    /** @psalm-suppress InvalidReturnStatement */
     return new Success;
 }