Arrange the other indatation issue for functions
Fix some issues of cmp indicated in alsa-devel

1. Calculating offset should be moved into a helper function because they are used twice.
2. Comments should be start with capital letter in each sentenses.
3. Use DIV_ROUND_UP macro instead of "for" loop.
4. This superfluous comment should say anything to be obvious about the code.
5. In an oPCR, the payload field is changed only by the device.

See:
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-April/061569.html
Fix some issues of amdtp indicated in alsa-devel

1. It would be easier to add some local variables for CIP headers.
2. "CIP header error" should be handled approproately, ignored or abort.
3. The comment related to ignoring SYT field should be indicate that ALSA has no spec for "presentation timestamp".
4. "data_block_counter" is unused.
5. typos for "calculate".

See:
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-April/061571.html