V4L/DVB (4454): Corrected debugging output of the mt2060

When debugging was disabled at lot of empty lines where printed anyway.
Reported by Rolf Ahrenberg and Sergei Haller.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>