Create only the default tmpDir directory

Author: ondrejmirtes

src/Command/CommandHelper.php

@@ -230,10 +230,9 @@ public static function begin(
 
 		if (!isset($tmpDir)) {
 			$tmpDir = sys_get_temp_dir() . '/phpstan';
+			$createDir($tmpDir);
 		}
 
-		$createDir($tmpDir);
-
 		if ($projectConfigFile !== null) {
 			$allCustomConfigFiles = self::getConfigFiles(
 				$currentWorkingDirectoryFileHelper,