httpd: Log xs_socket_accept failure reason

So far, it was expected that xs_socket_accept should work and while its
failure results in a termination, it was not properly logged. With this
change, an error message including the strerror message is being logged.

After experiencing some unexpected snac httpd shutdowns, I added a bit
of additional logging, including when xs_socket_accept fails. This
proved useful, as it unveiled a deeper error on my machine:

> xs_socket_accept failed: Too many open files

Since entering this code path results in termination, I thought
upstreaming this logging might be useful for others.

0 files changed, 0 insertions, 0 deletions