[PATCH] BUG_ON() Conversion in net/tulip/de2104x.c

hi,

this changes if() BUG(); constructs to BUG_ON() which is
cleaner and can better optimized away

One of the if()s contains a call to de_is_running(),
which seems to be safe to replace, but someone with more
knownledge of the code might want to verify this...

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>