Staging: comedi: fix whitespace coding style issues in comedi_fops.c

Solves warnings found by the checkpatch.pl tool: spaces before tabs.
Signed-off-by: Pieter De Praetere <pieterc.depraetere@ugent.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/comedi_fops.c

@@ -2105,6 +2105,7 @@ int comedi_alloc_board_minor(struct device *hardware_device)
 		kfree(info->device);
 		kfree(info);
 		printk(KERN_ERR
+
 		       "comedi: error: ran out of minor numbers for board device files.\n");
 		return -EBUSY;
 	}