Clean up camera driver

This patch does some light cleanup on the camera driver:

- removed unused return values or unused initializations
- remove backslashes at regular line ends (Python-style ?)
- removed redundant casts
- remove redundant parentheses
- wrapped long lines
- general whitespace cleanup
- fixed broken logic in s3c_camif_v4l2_g_input and s3c_camif_v4l2_g_output
- let mutex that really really wants to be a semaphore have its way

Signed-off-by: Werner Almesberger <werner@openmoko.org>

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