Staging: comedi: drivers: fix coding style issues in pcl816.c

This is a patch to the pcl816.c file that fixes up the following
issues:

ERROR: code indent should use tabs where possible		   x  2
WARNING: line over 80 characters				   x 34
WARNING: please, no space before tabs				   x  1
WARNING: braces {} are not necessary for single statement blocks   x  6
WARNING: printk() should include KERN_ facility level		   x 15
WARNING: braces {} are not necessary for any arm of this statement x  1

Signed-off-by: Gustavo Silva <silvagustavo@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>