Staging: comedi: fix missing KERN_facility level in ni_labpc.c

This is a patch to fix the "missing KERN_facility level" error found
when running the checkpatch.pl script

Signed-off-by: Aseem Sethi <aseemsethi@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/ni_labpc.c

@@ -536,7 +536,7 @@ int labpc_common_attach(struct comedi_device *dev, unsigned long iobase,
 	printk("\n");
 
 	if (iobase == 0) {
-		printk("io base address is zero!\n");
+		printk(KERN_ERR "io base address is zero!\n");
 		return -EINVAL;
 	}
 	/*  request io regions for isa boards */