bug symfony#10199 fix ProcessPipes (nicolas-grekas)

This PR was merged into the 2.5-dev branch.

Discussion
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fix ProcessPipes

Commits
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076d417 fix ProcessPipes

Author: fabpot

src/Symfony/Component/Process/ProcessPipes.php

@@ -120,8 +120,8 @@ public function getDescriptors()
                 array('file', '/dev/tty', 'w'),
                 array('file', '/dev/tty', 'w'),
             );
-        } elseif ($this->ptyMode && Porcess::isPtySupported()) {
-            $descriptors = array(
+        } elseif ($this->ptyMode && Process::isPtySupported()) {
+            return array(
                 array('pty'),
                 array('pty'),
                 array('pty'),