From 1d8cad58db277b8113df6b941c7c81a2fe461fae Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Sat, 4 Apr 2020 08:01:57 +0100
Subject: [PATCH] Mouse input: tidy some logic

---
 src/Input/FGMouseInput.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Input/FGMouseInput.cxx b/src/Input/FGMouseInput.cxx
index 2e2930079..66c101fae 100644
--- a/src/Input/FGMouseInput.cxx
+++ b/src/Input/FGMouseInput.cxx
@@ -561,7 +561,7 @@ void FGMouseInput::doMouseClick (int b, int updown, int x, int y, bool mainWindo
 
   SGSceneryPicks pickList = globals->get_renderer()->pick(windowPos);
 
-  if( updown != MOUSE_BUTTON_DOWN )
+  if( updown == MOUSE_BUTTON_UP )
   {
     // Execute the mouse up event in any case, may be we should
     // stop processing here?
@@ -572,7 +572,7 @@ void FGMouseInput::doMouseClick (int b, int updown, int x, int y, bool mainWindo
     {
       SGPickCallbackPtr& cb = callbacks.front();
       const SGSceneryPick* pick = getPick(pickList, cb);
-      cb->buttonReleased(ea->getModKeyMask(), *ea, pick ? &pick->info : 0);
+      cb->buttonReleased(ea->getModKeyMask(), *ea, pick ? &pick->info : nullptr);
 
       callbacks.pop_front();
     }