commit-reach: cleanups in can_all_from_reach...

Due to a regression introduced by 4fbcca4e "commit-reach: make
can_all_from_reach... linear" the series including b67f6b26
"commit-reach: properly peel tags" was merged to master quickly.

There were a few more cleanups left to apply in the series, which
are included by this change:

1. Clean up a comment that is in the incorrect style.

2. Replace multiple calls to clear_commit_marks() with one call to
   clear_commit_marks_many().

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit-reach.c

@@ -558,7 +558,8 @@ int can_all_from_reach_with_flag(struct object_array *from,
 		from_one = deref_tag(the_repository, from_one,
 				     "a from object", 0);
 		if (!from_one || from_one->type != OBJ_COMMIT) {
-			/* no way to tell if this is reachable by
+			/*
+			 * no way to tell if this is reachable by
 			 * looking at the ancestry chain alone, so
 			 * leave a note to ourselves not to worry about
 			 * this object anymore.
@@ -622,10 +623,7 @@ int can_all_from_reach_with_flag(struct object_array *from,
 	}
 
 cleanup:
-	for (i = 0; i < nr_commits; i++) {
-		clear_commit_marks(list[i], RESULT);
-		clear_commit_marks(list[i], assign_flag);
-	}
+	clear_commit_marks_many(nr_commits, list, RESULT | assign_flag);
 	free(list);
 
 	for (i = 0; i < from->nr; i++)