Check the image size captured by webcam
Check the image size captured by webcam

TODO: Add an API to webcam/v4l2, which returns the current capture size.

Signed-off-by: kfei <1da1ad03e627cea4baf20871022464fcc6a4b2c4@kfei.net>

kfei/sshcam,kfei/sshcam