From caa716d8592363d913ddccc8bebf64375cd8a4b8 Mon Sep 17 00:00:00 2001
From: John Bowler <jbowler@acm.org>
Date: Sun, 22 Nov 2015 19:52:12 -0800
Subject: [PATCH] Fix build break introduced from libpng17

12->12U in a compare when the other side is signed.

Signed-off-by: John Bowler <jbowler@acm.org>
---
 pngrutil.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pngrutil.c b/pngrutil.c
index 85b6d73df..0d3c549ca 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1948,7 +1948,7 @@ png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr)
    /* We need to have at least 12 bytes after the purpose string
     * in order to get the parameter information.
     */
-   if (endptr - buf <= 12U)
+   if (endptr - buf <= 12)
    {
       png_chunk_benign_error(png_ptr, "invalid");
       return;