From 49023f3d7e5026f891e99c758ccd7da182f0fa63 Mon Sep 17 00:00:00 2001
From: Paul Riseborough <p_riseborough@live.com.au>
Date: Sun, 13 Mar 2016 21:56:28 +1100
Subject: [PATCH] EKF: fix travis build error

---
 EKF/ekf.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/EKF/ekf.cpp b/EKF/ekf.cpp
index 12a1ffd177..51f3a64fa9 100644
--- a/EKF/ekf.cpp
+++ b/EKF/ekf.cpp
@@ -246,7 +246,8 @@ bool Ekf::update()
 
 			} else {
 				// calculate a filtered offset between the baro origin and local NED origin if we are not using the baro  as a height reference
-				_baro_hgt_offset += 0.02f * math::constrain((_baro_sample_delayed.hgt + _state.pos(2) - _baro_hgt_offset), -5.0f, 5.0f);
+				float offset_error = _baro_sample_delayed.hgt + _state.pos(2) - _baro_hgt_offset;
+				_baro_hgt_offset += 0.02f * math::constrain(offset_error, -5.0f, 5.0f);
 			}
 		}