Adjust zend_write_func signature

Make it return size_t instead of int, to line up with actual
implementation.

Author: nikic

Zend/zend.c

@@ -820,7 +820,7 @@ int zend_startup(zend_utility_functions *utility_functions) /* {{{ */
 	/* Set up utility functions and values */
 	zend_error_cb = utility_functions->error_function;
 	zend_printf = utility_functions->printf_function;
-	zend_write = (zend_write_func_t) utility_functions->write_function;
+	zend_write = utility_functions->write_function;
 	zend_fopen = utility_functions->fopen_function;
 	if (!zend_fopen) {
 		zend_fopen = zend_fopen_wrapper;

Zend/zend.h

@@ -205,7 +205,7 @@ typedef struct _zend_utility_values {
 	zend_bool html_errors;
 } zend_utility_values;
 
-typedef int (*zend_write_func_t)(const char *str, size_t str_length);
+typedef size_t (*zend_write_func_t)(const char *str, size_t str_length);
 
 #define zend_bailout()		_zend_bailout(__FILE__, __LINE__)
 

ext/ffi/tests/200.phpt

@@ -17,7 +17,7 @@ opcache.jit=0
 <?php
 require_once('utils.inc');
 $zend = FFI::cdef("
-    typedef int (*zend_write_func_t)(const char *str, size_t str_length);
+    typedef size_t (*zend_write_func_t)(const char *str, size_t str_length);
     extern zend_write_func_t zend_write;
 ", ffi_get_php_dll_name());