[media] xc2028: add missing break to switch

Coverity CID 1196501: Missing break in switch (MISSING_BREAK)

I introduced that bug recently by commit
96a5b3a8.
As a result, it will flood unintentionally error message to log.

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