From 50321b1ccd964c4f9a2584729d6be3e34f6ddb1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Sat, 8 Feb 2014 19:28:26 +0100
Subject: [PATCH] segmentation: Fix integer underflow check

error: comparison of unsigned expression < 0 is
always false [-Werror,-Wtautological-compare]
---
 ext/opencv/gstsegmentation.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/ext/opencv/gstsegmentation.cpp b/ext/opencv/gstsegmentation.cpp
index 1a48afd8c7..1f81fcaa8a 100644
--- a/ext/opencv/gstsegmentation.cpp
+++ b/ext/opencv/gstsegmentation.cpp
@@ -509,11 +509,13 @@ update_codebook (unsigned char *p, codeBook * c, unsigned *cbBounds,
   int matchChannel;
 
   for (n = 0; n < numChannels; n++) {
-    high[n] = *(p + n) + *(cbBounds + n);
+    high[n] = p[n] + cbBounds[n];
     if (high[n] > 255)
       high[n] = 255;
-    low[n] = *(p + n) - *(cbBounds + n);
-    if (low[n] < 0)
+
+    if (p[n] > cbBounds[n])
+      low[n] = p[n] - cbBounds[n];
+    else
       low[n] = 0;
   }