chore: fix some styling

Author: TorstenDittmann

tests/integration/closure_once.php

@@ -1,7 +1,6 @@
 <?php
-$clo = test_closure_once('closure works');
 
-echo $clo();
+echo test_closure_once('closure works')();
 echo ' ';
 
 try {

tests/src/lib.rs

@@ -114,7 +114,7 @@ mod tests {
             Command::new("cargo")
                 .arg("build")
                 .output()
-                .expect("failed to execute process")
+                .expect("failed to build extension")
                 .status
                 .success();
         });