From 4db9a5e6fe3836b8d65618d8c1b6282f57743fb4 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Tue, 3 Apr 2018 13:21:59 +1000
Subject: [PATCH] AP_HAL_SITL: remove cast to signed type

... we're currently taking an unsigned type, casting it to a signed type
and then comparing the result of that to an unsigned type.  That's
unhealthy.
---
 libraries/AP_HAL_SITL/UARTDriver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_SITL/UARTDriver.cpp b/libraries/AP_HAL_SITL/UARTDriver.cpp
index 9634b237be..053519e1f4 100644
--- a/libraries/AP_HAL_SITL/UARTDriver.cpp
+++ b/libraries/AP_HAL_SITL/UARTDriver.cpp
@@ -154,7 +154,7 @@ size_t UARTDriver::write(uint8_t c)
 
 size_t UARTDriver::write(const uint8_t *buffer, size_t size)
 {
-    if (txspace() <= (ssize_t)size) {
+    if (txspace() <= size) {
         size = txspace();
     }
     if (size <= 0) {