[media] davinci_vpfe: Revert "staging: media: davinci_vpfe: remove,unnecessary ret variable"

This reverts commit afa5d19a ("staging: media: davinci_vpfe: remove
unnecessary ret variable").

This patch is completely bogus and messed up the code big time.

I'm not sure what was intended, but this isn't it.

Cc: Thaissa Falbo <thaissa.falbo@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>