- clear T1_errno before using libt1 functions

diff --git a/php_imlib.c b/php_imlib.c
index 383fddd..9154d3a 100644
--- a/php_imlib.c
+++ b/php_imlib.c
@@ -2530,6 +2530,7 @@ PHP_FUNCTION(imlib_pstext)
 	ZEND_FETCH_RESOURCE(bg_img, Imlib_Image, &img, -1, "Imlib Image", le_imlib_img);
         ZEND_FETCH_RESOURCE(f_ind, int *, &fnt, -1, "Type 1 font", le_ps_font);

+	T1_errno = 0;
 	T1_AASetBitsPerPixel(32);

 	switch (aa_steps) {