MDL-56122 editpdf: Fix ghostscript checking

mod/assign/feedback/editpdf/classes/pdf.php

@@ -525,7 +525,7 @@ class pdf extends \FPDI {
     /**
      * Test that the configured path to ghostscript is correct and working.
      * @param bool $generateimage - If true - a test image will be generated to verify the install.
-     * @return bool
+     * @return stdClass
      */
     public static function test_gs_path($generateimage = true) {
         global $CFG;

mod/assign/feedback/editpdf/tests/editpdf_test.php

@@ -45,7 +45,8 @@ class assignfeedback_editpdf_testcase extends mod_assign_base_testcase {
 
     protected function setUp() {
         // Skip this test if ghostscript is not supported.
-        if (!pdf::test_gs_path(false)) {
+        $result = pdf::test_gs_path(false);
+        if ($result->status !== assignfeedback_editpdf\pdf::GSPATH_OK) {
             $this->markTestSkipped('Ghostscript not setup');
             return;
         }