comedi: checkpatch errors/warnings

[Andreas Siegling]

The following patch-series will fix checkpatch errors and warnings
which are caused by false spacing and missing blank lines.

It will fix those errors/warnings in drivers/staging/comedi/ and all its
subdirectories. The fixed errors/warnings are:
	WARNING: Missing a blank line after declarations	5 times
	ERROR: trailing whitespace                              once
	ERROR: space prohibited before that ',' (ctx:WxW)       once
	WARNING: please, no space before tabs                   8 times
	ERROR: code indent should use tabs where possible	44 times

After applying the series the following checkpatch errors/warnings will remain
in files in drivers/staging/comedi/ and its subdirectories:
	WARNING: line over 80 characters
	WARNING: quoted string split across lines
	WARNING: break quoted strings at a space character
	WARNING: memory barrier without comment
	WARNING: suspect code indent for conditional statements (x, y)
	WARNING: Use of volatile is usually wrong

Signed-off-by: Andreas Siegling <andreas.siegling@xxxxxx>
Signed-off-by: Zhutao Lu <lvzhutao@xxxxxxxxx>

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