Device names under OS X are very long. Previously a short form was
available, but this seems to no longer be the case. This patch doubles
the size of the buffer for device names, allowing the real device name
to fit. If they don't fit, device autodetection fails.
See http://trac.macports.org/ticket/27819ClosesHomebrew/homebrew#10388.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>