staging: Fixes some checkpatch warnings in asus_oled/asus_oled.c

This fixes the following warnings:

	1: Changes a printk(KERN_ERR) call to a pr_err call in line 785
	2: Changes a printk(KERN_ERR) call to a pr_err call in line 791
	3: Changes a printk(KERN_ERR) call to a pr_err call in line 798
	4: Reduces line length below 80 at line 785 (Not intended)
	5: Reduces line length below 80 at line 798 (Not intended)

Signed-off-by: Cruz Julian Bishop <cruz@massive-dynamics.biz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>