linux-phytec-ti

[media] e4000: rename some variables

Rename some variables.
Change error status checks from (ret < 0) to (ret).
No actual functionality changes.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>