[dconf] Avoid posix_fallocate for now

[Ryan Lortie <ryanl src gnome org>]

commit e3dd1d8ac6839851cb3015e89cdf39ecb2e2b081
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Nov 2 11:23:28 2010 -0400

    Avoid posix_fallocate for now
    
    Use ftruncate() instead.  posix_fallocate() is not portable yet.

 engine/dconf-engine.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/engine/dconf-engine.c b/engine/dconf-engine.c
index cf57431..2b8bd70 100644
--- a/engine/dconf-engine.c
+++ b/engine/dconf-engine.c
@@ -144,7 +144,7 @@ dconf_engine_setup_user (DConfEngine *engine)
 
           if (fd >= 0)
             {
-              if (posix_fallocate (fd, 0, 1) == 0)
+              if (ftruncate (fd, 1) == 0)
                 {
                   engine->shm = mmap (NULL, 1, PROT_READ, MAP_SHARED, fd, 0);