[PATCH] Fix segfault during NBD iotest 083

[Jagannathan Raman]

Hi,

The patch fixes a segfault issue. error_prepend() in
qio_channel_readv_full_all() sets a NULL *errp when
ret is 0.

We ran the following tests with this patch and they all passed:
- cd tests/qemu-iotests && ./check -nbd 083
- make check
- make check-iotests
- CI using Travis. We also kicked off gitlab CI, but didn't
  hear anything back from the server

Jagannathan Raman (1):
  io: error_prepend() in qio_channel_readv_full_all() causes segfault

 io/channel.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

-- 
1.8.3.1