Fix copyright and use consistent C89 comments
diff --git a/src/core/support/stack_lockfree.c b/src/core/support/stack_lockfree.c
index b2f5880..2c97ee1 100644
--- a/src/core/support/stack_lockfree.c
+++ b/src/core/support/stack_lockfree.c
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -99,8 +99,8 @@
/* Point the head at reserved dummy entry */
stack->head.contents.index = INVALID_ENTRY_INDEX;
+ /* Fill in the pad and aba_ctr to avoid confusing memcheck tools */
#ifdef GPR_ARCH_64
- // Fill in the pad to avoid confusing memcheck tools
stack->head.contents.pad = 0;
#endif
stack->head.contents.aba_ctr = 0;
@@ -121,7 +121,7 @@
/* First fill in the entry's index and aba ctr for new head */
newhead.contents.index = (uint16_t)entry;
#ifdef GPR_ARCH_64
- // Fill in the pad to avoid confusing memcheck tools
+ /* Fill in the pad to avoid confusing memcheck tools */
newhead.contents.pad = 0;
#endif