- clear T1_errno before using libt1 functions (cont)

diff --git a/php_imlib.c b/php_imlib.c
index 9154d3a..a17811e 100644
--- a/php_imlib.c
+++ b/php_imlib.c
@@ -2817,6 +2817,8 @@ PHP_FUNCTION(imlib_psbbox)
 #define new_x(a, b) (int) ((a) * cos_a - (b) * sin_a)
 #define new_y(a, b) (int) ((a) * sin_a + (b) * cos_a)

+	T1_errno = 0;
+
 	if (per_char) {
 		space += T1_GetCharWidth(*f_ind, ' ');
 		cur_x = cur_y = 0;