Clipboard.c: check pointer before usage

The code also worked with pWindow being NULL but it did some unnecessary stuff.

Clipboard.c: check pointer before usage
509ae051 · Ulrich Sibiller · Mike Gabriel · eb51bcb6 · 509ae051
Commit 509ae051 authored Nov 17, 2019 by Ulrich Sibiller Committed by Mike Gabriel Jan 05, 2020
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Clipboard.c nx-X11/programs/Xserver/hw/nxagent/Clipboard.c +1 -1

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--- a/nx-X11/programs/Xserver/hw/nxagent/Clipboard.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Clipboard.c
@@ -576,7 +576,7 @@ void nxagentClearClipboard(ClientPtr pClient, WindowPtr pWindow)
    }
  }
-  if (pWindow == lastClientWindowPtr)
+  if (pWindow && pWindow == lastClientWindowPtr)
  {
    lastClientWindowPtr = NULL;
    SetClientSelectionStage(None);