media: dvb-frontends: clean up unneeded else

Clean up unneeded 'else'.

Link: https://lore.kernel.org/linux-media/20220408092831.45755-1-wanjiabing@vivo.com


Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>