ext/posix: Edit clean section

Author: arshidkv12

ext/posix/tests/posix_access_flags.phpt

@@ -44,11 +44,7 @@ if (posix_access($testfile, POSIX_F_OK)) {
 ?>
 --CLEAN--
 <?php
-$dir = __DIR__;
-$testfile = "$dir/testfile.txt";
-if (file_exists($testfile)) {
-    unlink($testfile);
-}
+unlink(__DIR__ . '/testfile.txt');
 ?>
 --EXPECTF--
 posix_access(): Argument #2 ($flags) must be a bitmask of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK, and POSIX_X_OK