staging: wlags49_h2: Use C99 __func__

in DBG machinery so you don't have to declare DBG_FUNC at
the start of all functions.

This just makes it easy to add DBG conforming to existing code.

The patch reformats the changed #defines to satisfy checkstyle.pl

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>