log: Fix incorrect documentation of log_filter.cat_list

Logging category lists are terminated by LOGC_END, not LOGC_NONE.

Fixes: e9c8d49d54 ("log: Add an implementation of logging")

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/log.h b/include/log.h
index 58787a3..d921f0a 100644
--- a/include/log.h
+++ b/include/log.h
@@ -372,7 +372,7 @@
  *	new filter, and must be provided when removing a previously added
  *	filter.
  * @flags: Flags for this filter (LOGFF_...)
- * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
+ * @cat_list: List of categories to allow (terminated by %LOGC_END). If empty
  *	then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
  *	can be provided
  * @max_level: Maximum log level to allow
@@ -450,7 +450,7 @@
  *
  * @drv_name: Driver name to add the filter to (since each driver only has a
  *	single device)
- * @cat_list: List of categories to allow (terminated by LOGC_none). If empty
+ * @cat_list: List of categories to allow (terminated by %LOGC_END). If empty
  *	then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
  *	can be provided
  * @max_level: Maximum log level to allow