V4L/DVB: zoran: remove variable shadowing

The loop counter j is declared twice in function error_handler().
Remove the redundant declaration.

This will remove the following sparse warning (see "make C=1"):
 * symbol 'j' shadows an earlier one

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>