Staging: comedi: drivers: fix coding style issues in pcl812.c

This is a patch to the pcl812.c file that fixes up the following
issues:

ERROR: code indent should use tabs where possible		   x 27
WARNING: line over 80 characters				   x 37
WARNING: please, no space before tabs				   x 13
WARNING: braces {} are not necessary for single statement blocks   x  2
WARNING: printk() should include KERN_ facility level		   x 22
WARNING: braces {} are not necessary for any arm of this statement x  5

Signed-off-by: Gustavo Silva <silvagustavo@users.sourceforge.net>
Acked-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>