Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/aimeos/ai-swiftmailer/inspections/90395d50-adf6-4996-97d1-3e82646a094b

Enabled analysis tools:
 - PHP Analyzer
 - PHP PDepend
 - PHP Similarity Analyzer
 - PHP Change Tracking Analyzer
Merge pull request #1 from aimeos/scrutinizer-patch-1

Scrutinizer Auto-Fixes