CLEANUP: threads: fix misleading comment about all_threads_mask
This variable changed a bit after 1.8, it's never zero anymore.
diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index 019d749..6f78876 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -26,9 +26,10 @@
#include <common/initcall.h>
/* Note about all_threads_mask :
- * - with threads support disabled, this symbol is defined as zero (0UL).
- * - with threads enabled, this variable is never zero, it contains the mask
- * of enabled threads. Thus if only one thread is enabled, it equals 1.
+ * - this variable is comprised between 1 and LONGBITS.
+ * - with threads support disabled, this symbol is defined as constant 1UL.
+ * - with threads enabled, it contains the mask of enabled threads. Thus if
+ * only one thread is enabled, it equals 1.
*/
#ifndef USE_THREAD