Fix build error

Author: ivanlanin

Classes/PHPPowerPoint/Writer/PowerPoint2007.php

@@ -223,9 +223,7 @@ public function save($pFilename = null)
             // Add slides (drawings, ...) and slide relationships (drawings, ...)
             for ($i = 0; $i < $this->_presentation->getSlideCount(); ++$i) {
                 // Add slide
-                $objZip->addFromString(
-                    'ppt/slides/_rels/slide' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeSlideRelationships($this->_presentation->getSlide($i))
-                );
+                $objZip->addFromString('ppt/slides/_rels/slide' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeSlideRelationships($this->_presentation->getSlide($i)));
                 $objZip->addFromString('ppt/slides/slide' . ($i + 1) . '.xml', $this->getWriterPart('Slide')->writeSlide($this->_presentation->getSlide($i)));
             }