use normalizePath to have a proper target path

apps/files/ajax/newfile.php

@@ -65,9 +65,7 @@ if($source) {
 	$target=$dir.'/'.$filename;
 	$result=OC_Filesystem::file_put_contents($target, $sourceStream);
 	if($result) {
-		if($target[0] != '/') {
-			$target = '/'.$target;
-		}
+		$target = OC_Filesystem::normalizePath($target);
 		$meta = OC_FileCache::get($target);
 		$mime=$meta['mimetype'];
 		$id = OC_FileCache::getId($target);