only make the directory if needed

Author: lkwdwrd

composer.json

@@ -1,6 +1,6 @@
 {
 	"name" : "lkwdwrd/wp-muplugin-loader",
-	"version" : "1.0.2",
+	"version" : "1.0.3",
 	"description" : "A drop-in MU Plugin loader for WordPress",
 	"keywords" : ["wordpress", "muplugin", "loader"],
 	"type" : "composer-plugin",

src/lkwdwrd/Composer/MULoaderPlugin.php

@@ -131,7 +131,9 @@ public function dumpRequireFile() {
 		$toLoader = DIRECTORY_SEPARATOR . Util\rel_path( $muPath, $loadFile );
 
 		// Write the boostrapping PHP file.
-		mkdir( $muPath, 0755, true );
+		if ( !file_exists( $muPath ) ) {
+			mkdir( $muPath, 0755, true );
+		}
 		file_put_contents(
 			$muPath . 'mu-require.php',
 			"<?php\nrequire_once __DIR__ . '${toLoader}';\n"