Description:
------------
function static ZIPARCHIVE_METHOD(addEmptyDir) still return true but the directory did not created.

	idx = zip_stat(intern, s, 0, &sb);
	if (idx >= 0) {
		RETVAL_FALSE;
	} else {
		if (zip_add_dir(intern, (const char *)s) == -1) {
			RETVAL_FALSE;
		}
		zip_error_clear(intern);
		RETVAL_TRUE;
	}


I propose the following patch:
`````
--- a/ext/zip/php_zip.c
+++ b/ext/zip/php_zip.c
@@ -1603,10 +1603,14 @@ static ZIPARCHIVE_METHOD(addEmptyDir)
                RETVAL_FALSE;
        } else {
                if (zip_add_dir(intern, (const char *)s) == -1) {
+                       zip_error_clear(intern);
                        RETVAL_FALSE;
                }
-              zip_error_clear(intern);
-               RETVAL_TRUE;
+               else
+               {
+                       zip_error_clear(intern);
+                       RETVAL_TRUE;
+               }
        }
 
        if (s != dirname) {

Test script:
---------------
<?php
	ini_set('memory_limit', -1);
	$archive = new ZipArchive();
	$archive->open('_test.zip', ZIPARCHIVE::CREATE);
	var_dump($archive->addEmptyDir(str_repeat("t", 0x7fffffff)));
	print_r($archive);
	$archive->close();

?>

Expected result:
----------------
bool(false)
ZipArchive Object
(
    [status] => 0
    [statusSys] => 0
    [numFiles] => 0
    [filename] => /home/tuannh/BUGS/TBB_TEST/_test.zip
    [comment] => 
)

Actual result:
--------------
bool(true)
ZipArchive Object
(
    [status] => 0
    [statusSys] => 0
    [numFiles] => 0
    [filename] => /home/tuannh/BUGS/TBB_TEST/_test.zip
    [comment] => 
)