[PATCH] dvb: nxt200x: remove null check before kfree()

Removed unnecessary null check before kfree() ...inspired by the big patch
from Jesper Juhl.

Signed-off-by: Michael Krufky <mkrufky@m1k.net>
Cc: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>