From adb82e13ee738be652f7dd471e9a0840d84923c1 Mon Sep 17 00:00:00 2001
From: Pierre Kancir <pierre.kancir.emn@gmail.com>
Date: Wed, 11 Aug 2021 00:29:32 +0200
Subject: [PATCH] AP_Compass: fix externalAHRS detection

'A = B >= C' kind. The expression is calculated as following: 'A = (B >= C)'
---
 libraries/AP_Compass/AP_Compass.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_Compass/AP_Compass.cpp b/libraries/AP_Compass/AP_Compass.cpp
index 8cc61c8dde..cf41db9b65 100644
--- a/libraries/AP_Compass/AP_Compass.cpp
+++ b/libraries/AP_Compass/AP_Compass.cpp
@@ -1206,7 +1206,8 @@ void Compass::_probe_external_i2c_compasses(void)
 void Compass::_detect_backends(void)
 {
 #if HAL_EXTERNAL_AHRS_ENABLED
-    if (int8_t serial_port = AP::externalAHRS().get_port() >= 0) {
+    const int8_t serial_port = AP::externalAHRS().get_port();
+    if (serial_port >= 0) {
         ADD_BACKEND(DRIVER_SERIAL, new AP_Compass_ExternalAHRS(serial_port));
     }
 #endif