Add comment about hbp overflow in GC_install_counts

(fix of commit 6a32bb4)

Issue #245 (bdwgc).

* headers.c (GC_install_counts): Better comment for the case of
overflow.

1 files changed, 1 insertions, 1 deletions

diff --git a/headers.c b/headers.c
index 8267872d..462da89f 100644
--- a/headers.c
+++ b/headers.c
@@ -285,7 +285,7 @@ GC_INNER GC_bool GC_install_counts(struct hblk *h, size_t sz/* bytes */)
     for (hbp = h; (word)hbp < (word)h + sz; hbp += BOTTOM_SZ) {
         if (!get_index((word) hbp)) return(FALSE);
         if ((word)hbp > (~(word)0) - (word)BOTTOM_SZ * HBLKSIZE)
-            break; /* overflow */
+            break; /* overflow of hbp+=BOTTOM_SZ is expected */
     }
     if (!get_index((word)h + sz - 1)) return(FALSE);
     for (hbp = h + 1; (word)hbp < (word)h + sz; hbp += 1) {