Correct signature of error handlers

Author: Cakasim

src/Http/Client/StreamClient.php

@@ -30,9 +30,10 @@ public function sendRequest(RequestInterface $request): ResponseInterface
 
         // Register temporary error handler to catch fopen warnings.
         $err = [];
-        set_error_handler(function (int $code, string $message) use (&$err): void {
+        set_error_handler(function (int $code, string $message) use (&$err): bool {
             $err['code'] = $code;
             $err['message'] = $message;
+            return true;
         });
 
         // Open the file and restore the error handler.

src/Http/Factory/StreamFactory.php

@@ -44,9 +44,10 @@ public function createStreamFromFile(string $filename, string $mode = 'r'): Stre
     {
         // Register temporary error handler to catch fopen warnings.
         $err = [];
-        set_error_handler(function (int $code, string $message) use (&$err): void {
+        set_error_handler(function (int $code, string $message) use (&$err): bool {
             $err['code'] = $code;
             $err['message'] = $message;
+            return true;
         });
 
         // Open the file and restore the error handler.