[libvirt] [PATCH] util: check for NULL parameter in virFileWrapperFdCatchError

[Eric Blake]

> This reverts 8927c0e qemu: fix a crash when save file can't be opened
> and allows virFileWrapperFdCatchError to be called with NULL instead.
> ---
>  src/qemu/qemu_driver.c |    6 ++----
>  src/util/virfile.c     |    2 +-
>  2 files changed, 3 insertions(+), 5 deletions(-)

ACK.