tree-wide: Some glnx_fstatat_allow_noent() porting

The new API is definitely nicer.

Closes: #1180
Approved by: jlebon

src/libostree/ostree-repo-commit.c

@@ -1249,12 +1249,10 @@ cleanup_tmpdir (OstreeRepo        *self,
       if (strcmp (dent->d_name, "cache") == 0)
         continue;
 
-      if (TEMP_FAILURE_RETRY (fstatat (dfd_iter.fd, dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW)) < 0)
-        {
-          if (errno == ENOENT) /* Did another cleanup win? */
-            continue;
-          return glnx_throw_errno_prefix (error, "fstatat(%s)", dent->d_name);
-        }
+      if (!glnx_fstatat_allow_noent (dfd_iter.fd, dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW, error))
+        return FALSE;
+      if (errno == ENOENT) /* Did another cleanup win? */
+        continue;
 
       /* First, if it's a directory which needs locking, but it's
        * busy, skip it.