We were removing the file before testing, ignoring the error from stat, and then
grepping for `Error: Unrecognized file type for named-pipe: ` (because nothing
was sent to stdout).

This fix:

1. Changes our stat command to output failed to stdout on failure to ensure that
bugs like this *can't* happen.
2. Checks to make sure stat actually succeeds.

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>