staging: comedi: drivers.c: checkpatch.pl --strict cleanup

Fix the checkpatch.pl --strict issues:

CHECK: DEFINE_MUTEX definition without comment
CHECK: braces {} should be used on all arms of this statement
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers.c

@@ -38,6 +38,7 @@
 #include "comedi_internal.h"
 
 struct comedi_driver *comedi_drivers;
+/* protects access to comedi_drivers */
 DEFINE_MUTEX(comedi_drivers_list_lock);
 
 int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev)
@@ -566,8 +567,9 @@ int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 			dev->board_ptr = comedi_recognize(driv, it->board_name);
 			if (dev->board_ptr)
 				break;
-		} else if (strcmp(driv->driver_name, it->board_name) == 0)
+		} else if (strcmp(driv->driver_name, it->board_name) == 0) {
 			break;
+		}
 		module_put(driv->module);
 	}
 	if (driv == NULL) {