Clarify the comment

This is the intent that was not obvious to me when I first reviewed this change.

Clarify the comment
This is the intent that was not obvious to me when I first reviewed this change.
d86f1850 · Dridi Boukelmoune · 429835da · d86f1850
Commit d86f1850 authored Apr 10, 2019 by Dridi Boukelmoune
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cache_hash.c bin/varnishd/cache/cache_hash.c +2 -2

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--- a/bin/varnishd/cache/cache_hash.c
+++ b/bin/varnishd/cache/cache_hash.c
@@ -778,8 +778,8 @@ HSH_Cancel(struct worker *wrk, struct objcore *oc, struct boc *boc)
 		return;

 	/*
-	 * the caller-provided boc is optional, if they do not have one, we grab
-	 * a ref
+	 * NB: we use two distinct variables to only release the reference if
+	 * we had to acquire one. The caller-provided boc is optional.
 	 */
 	if (boc == NULL)
 		bocref = boc = HSH_RefBoc(oc);