api: fix bug in string_match when mask begins and ends with "*"

The bug was string_match returning 0 (instead of 1) if mask begins and ends with
"*" and if string and mask have same length (except both "*") with same content:

string_match("abc",  "*abc*", 0) == 0  // BUG: it should return 1
string_match("abcd", "*abc*", 0) == 1  // OK

ChangeLog

@@ -1,7 +1,7 @@
 WeeChat ChangeLog
 =================
 Sébastien Helleu <flashcode@flashtux.org>
-v0.4.1-dev, 2013-03-09
+v0.4.1-dev, 2013-03-11
 
 
 This document lists all changes for each version.
@@ -29,6 +29,7 @@ Version 0.4.1 (under dev!)
   weechat.history.max_buffer_lines_minutes is set (bug #38197)
 * core: use default hash/comparison callback for keys of type
   integer/pointer/time in hashtable
+* api: fix bug in string_match when mask begins and ends with "*"
 * api: allow hashtable with keys that are not strings in function
   hashtable_add_to_infolist
 * api: fix function string_mask_to_regex: escape all special chars used in regex

src/core/wee-string.c

@@ -412,7 +412,7 @@ string_match (const char *string, const char *mask, int case_sensitive)
     if ((mask[0] == '*') && (last == '*'))
     {
         /* not enough chars in string to match */
-        if (len_string < len_mask - 1)
+        if (len_string < len_mask - 2)
             return 0;
         /* keep only relevant chars in mask for searching string */
         mask2 = string_strndup (mask + 1, len_mask - 2);