CHROMIUM: test_dbus: Log errno on read() failure

crrev.com/c/5623191 improved our diagnostics here, but it's still not
clear what actually went wrong across this test_fds[] pipe. For that,
we'd like to at least capture errno.

BUG=b:342438425
TEST=CQ

Change-Id: Ic13e49d48a27d1d06ff6b334264552bf66fe3d3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libnih/+/5671649
Tested-by: Brian Norris <briannorris@chromium.org>
Commit-Queue: Sarthak Kukreti <sarthakkukreti@google.com>
Auto-Submit: Brian Norris <briannorris@chromium.org>
Reviewed-by: Sarthak Kukreti <sarthakkukreti@google.com>
1 file changed