Fix data type from long to size_t

Author: youkidearitai

ext/mbstring/mbstring.c

@@ -2963,8 +2963,8 @@ static zend_string* trim_each_wchar(zend_string *str, zend_string *what, MB_TRIM
 	size_t what_out_len = 0;
 	size_t what_len = ZSTR_LEN(what);
 	unsigned int state = 0;
-	long left = 0;
-	long right = 0;
+	size_t left = 0;
+	size_t right = 0;
 	size_t total_len = 0;
 	bool first = true;
 
@@ -3005,7 +3005,7 @@ static zend_string* trim_each_wchar(zend_string *str, zend_string *what, MB_TRIM
 			for (size_t j = 0; j < out_len; j++) {
 				uint32_t w = wchar_buf[j];
 				if (is_trim_wchar(w, &what_ht)) {
-					right -= 1;
+					right += 1;
 				} else {
 					right = 0;
 				}
@@ -3015,7 +3015,7 @@ static zend_string* trim_each_wchar(zend_string *str, zend_string *what, MB_TRIM
 
 	zend_hash_destroy(&what_ht);
 
-	return mb_get_substr(str, left, total_len + (right - left), enc);
+	return mb_get_substr(str, left, total_len - (right + left), enc);
 }
 
 static zend_string* mb_trim_default_chars(zend_string *str, MB_TRIM_MODE mode, const mbfl_encoding *enc)