[media] em28xx-cards: remove a wrong indent level

This code is correct but the indenting is wrong and triggers a static
checker warning "add curly braces?".
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>