Fix requested changes from review

Author: Timon de Groot

lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php

@@ -10,8 +10,6 @@
 
 /**
  * Image adapter from ImageMagick.
- *
- * @property \Imagick $_imageHandler
  */
 class ImageMagick extends AbstractAdapter
 {
@@ -38,18 +36,23 @@ class ImageMagick extends AbstractAdapter
         'sharpen' => ['radius' => 4, 'deviation' => 1],
     ];
 
+    /**
+     * @var \Imagick
+     */
+    protected $_imageHandler;
+
     /**
      * Colorspace of the image
      *
      * @var int
      */
-    protected $colorspace = -1;
+    private $colorspace = -1;
     /**
      * Original colorspace of the image
      *
      * @var int
      */
-    protected $originalColorspace = -1;
+    private $originalColorspace = -1;
 
     /**
      * Set/get background color. Check Imagick::COLOR_* constants
@@ -589,7 +592,8 @@ private function addSingleWatermark($positionX, int $positionY, \Imagick $waterm
     public function getColorspace(): int
     {
         if ($this->colorspace === -1) {
-            $this->originalColorspace = $this->colorspace = $this->_imageHandler->getImageColorspace();
+            $this->colorspace = $this->_imageHandler->getImageColorspace();
+            $this->originalColorspace = $this->colorspace;
         }
 
         return $this->colorspace;