[glib/wip/3v1n0/regex-pcre2-flags-fixes] regex: Avoid allocating offsets until we've a match

[Marco Trevisan <marcotrevi src gnome org>]

commit 4522c433ae6a4fd13e6f936e43e7bae076e25be7
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Sep 6 19:19:03 2022 +0200

    regex: Avoid allocating offsets until we've a match
    
    There's no much point of pre-allocating offsets given that we're doing
    this when needed if only have matches to store.
    
    So let's just allocate the spaces for the dummy offset we depend on,
    while allocate the others on demand.

 glib/gregex.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
---
diff --git a/glib/gregex.c b/glib/gregex.c
index b757638556..bd9330b4d0 100644
--- a/glib/gregex.c
+++ b/glib/gregex.c
@@ -831,15 +831,11 @@ match_info_new (const GRegex     *regex,
     {
       /* These values should be enough for most cases, if they are not
        * enough g_regex_match_all_full() will expand them. */
-      match_info->n_offsets = 24;
       match_info->n_workspace = 100;
       match_info->workspace = g_new (gint, match_info->n_workspace);
     }
-  else
-    {
-      match_info->n_offsets = (match_info->n_subpatterns + 1) * 3;
-    }
 
+  match_info->n_offsets = 2;
   match_info->offsets = g_new0 (gint, match_info->n_offsets);
   /* Set an invalid position for the previous match. */
   match_info->offsets[0] = -1;