When zlog_init is given a path to a non-regular file, it doesn't return an error. Instead, the logger is configured as if it was given an empty file.

For example, consider the following:

zlog_init("/etc/zlog.conf")  // no error, works fine
zlog_init("/etc/zlog.con")   // error, works fine
zlog_init("/etc")            // no error ???

Shouldn't an error be returned in the last case?