From c44a8309f98acad46657d3f5180558ff4b75a678 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Thu, 28 Jun 2018 11:04:59 +1000
Subject: [PATCH] AP_Bootloader: fixed strncmp bug

---
 Tools/AP_Bootloader/support.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Tools/AP_Bootloader/support.cpp b/Tools/AP_Bootloader/support.cpp
index 993c89ceb3..82971ead2f 100644
--- a/Tools/AP_Bootloader/support.cpp
+++ b/Tools/AP_Bootloader/support.cpp
@@ -283,6 +283,9 @@ int strncmp(const char *s1, const char *s2, size_t n)
         s1++;
         s2++;
     }
+    if (n == 0) {
+        return 0;
+    }
     return (*s1 - *s2);
 }