lib: Port some manual close() cleanups to be glnx_fd_close

Just noticed this while reading some code, we didn't have many manual
`out: close()` bits left, this pushes us over the edge to autocleanup
almost everywhere.

Closes: #332
Approved by: jlebon

src/libostree/ostree-sysroot-deploy.c

@@ -172,8 +172,8 @@ copy_dir_recurse (int              src_parent_dfd,
                   GError         **error)
 {
   gboolean ret = FALSE;
-  int src_dfd = -1;
-  int dest_dfd = -1;
+  glnx_fd_close int src_dfd = -1;
+  glnx_fd_close int dest_dfd = -1;
   DIR *srcd = NULL;
   struct dirent *dent;
 
@@ -240,10 +240,6 @@ copy_dir_recurse (int              src_parent_dfd,
       /* Note the srcd owns src_dfd */
       src_dfd = -1;
     }
-  if (src_dfd != -1)
-    (void) close (src_dfd);
-  if (dest_dfd != -1)
-    (void) close (dest_dfd);
   return ret;
 }
 
@@ -257,8 +253,8 @@ ensure_directory_from_template (int                 orig_etc_fd,
                                 GError            **error)
 {
   gboolean ret = FALSE;
-  int src_dfd = -1;
-  int target_dfd = -1;
+  glnx_fd_close int src_dfd = -1;
+  glnx_fd_close int target_dfd = -1;
 
   g_assert (path != NULL);
   g_assert (*path != '/' && *path != '\0');
@@ -316,10 +312,6 @@ ensure_directory_from_template (int                 orig_etc_fd,
       target_dfd = -1;
     }
  out:
-  if (src_dfd != -1)
-    (void) close (src_dfd);
-  if (target_dfd != -1)
-    (void) close (target_dfd);
   return ret;
 }
 
@@ -341,7 +333,7 @@ copy_modified_config_file (int                 orig_etc_fd,
   gboolean ret = FALSE;
   struct stat modified_stbuf;
   struct stat new_stbuf;
-  int dest_parent_dfd = -1;
+  glnx_fd_close int dest_parent_dfd = -1;
 
   if (fstatat (modified_etc_fd, path, &modified_stbuf, AT_SYMLINK_NOFOLLOW) < 0)
     {
@@ -431,8 +423,6 @@ copy_modified_config_file (int                 orig_etc_fd,
 
   ret = TRUE;
  out:
-  if (dest_parent_dfd != -1)
-    (void) close (dest_parent_dfd);
   return ret;
 }
 
@@ -459,9 +449,9 @@ merge_etc_changes (GFile          *orig_etc,
   g_autoptr(GPtrArray) removed = NULL;
   g_autoptr(GPtrArray) added = NULL;
   guint i;
-  int orig_etc_fd = -1;
-  int modified_etc_fd = -1;
-  int new_etc_fd = -1; 
+  glnx_fd_close int orig_etc_fd = -1;
+  glnx_fd_close int modified_etc_fd = -1;
+  glnx_fd_close int new_etc_fd = -1; 
 
   modified = g_ptr_array_new_with_free_func ((GDestroyNotify) ostree_diff_item_unref);
   removed = g_ptr_array_new_with_free_func ((GDestroyNotify) g_object_unref);
@@ -538,12 +528,6 @@ merge_etc_changes (GFile          *orig_etc,
 
   ret = TRUE;
  out:
-  if (orig_etc_fd != -1)
-    (void) close (orig_etc_fd);
-  if (modified_etc_fd != -1)
-    (void) close (modified_etc_fd);
-  if (new_etc_fd != -1)
-    (void) close (new_etc_fd);
   return ret;
 }