bug #37191 [HttpClient] fix offset computation for data chunks (nicol…

…as-grekas)

This PR was merged into the 4.4 branch.

Discussion
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[HttpClient] fix offset computation for data chunks

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

A minor thingy, still a bugfix.

Commits
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ff05be0 [HttpClient] fix offset computation for data chunks

src/Symfony/Component/HttpClient/Response/ResponseTrait.php

@@ -359,8 +359,9 @@ public static function stream(iterable $responses, float $timeout = null): \Gene
                                 continue;
                             }
 
-                            $response->offset += \strlen($chunk);
+                            $chunkLen = \strlen($chunk);
                             $chunk = new DataChunk($response->offset, $chunk);
+                            $response->offset += $chunkLen;
                         } elseif (null === $chunk) {
                             $e = $multi->handlesActivity[$j][0];
                             unset($responses[$j], $multi->handlesActivity[$j]);