[media] dw2102: some missing unlocks on error

We recently introduced some new error paths but the unlocks are missing.
Fixes: 0065a79a ('[media] dw2102: Don't use dynamic static allocation')

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>