[libglnx] glnx_release_lock_file - Don't close fd -1 (i.e. if we never locked)

[Alexander Larsson <alexl src gnome org>]

commit 4f83b70f690f437b983333a7c43def3ed6ca2d46
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Jun 28 11:23:47 2016 +0200

    glnx_release_lock_file - Don't close fd -1 (i.e. if we never locked)
    
    This happens a lot if you use autocleanup for lock files, and the
    function returns early without the lock being taken.

 glnx-lockfile.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/glnx-lockfile.c b/glnx-lockfile.c
index be9ad3a..7dd69e9 100644
--- a/glnx-lockfile.c
+++ b/glnx-lockfile.c
@@ -187,7 +187,8 @@ void glnx_release_lock_file(GLnxLockFile *f) {
                 f->path = NULL;
         }
 
-        (void) close (f->fd);
+        if (f->fd != -1)
+                (void) close (f->fd);
         f->fd = -1;
         f->operation = 0;
 }