fix assert logic

The logic value in the assert should be |false| (0) to hit.

BUG=none
TEST=none

Change-Id: I72cba979b19608db40f5f51d6fc3581a4825190a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libnih/+/5623058
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Brian Norris <briannorris@chromium.org>
1 file changed