Keyboard.c: nullify freed pointers

While trying to properly free memory allocated by XKB I accidently called nxagentFreeKeyboardDeviceData twice and noticed it would cause a segfault here. As the other pointers are also nullified after being freed let's just do it here, too.

Keyboard.c: nullify freed pointers
340de78e · Ulrich Sibiller · 3b06ad51 · 340de78e
Commit 340de78e authored Jun 17, 2019 by Ulrich Sibiller
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Keyboard.c nx-X11/programs/Xserver/hw/nxagent/Keyboard.c +4 -0

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--- a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
@@ -1327,6 +1327,8 @@ static int nxagentFreeKeyboardDeviceData(DeviceIntPtr dev)
      dev->focus = NULL;
  }
+  if (dev->kbdfeed)
+  {
      for (k = dev->kbdfeed; k; k = knext)
      {
          knext = k->next;
@@ -1336,6 +1338,8 @@ static int nxagentFreeKeyboardDeviceData(DeviceIntPtr dev)
          #endif
          free(k);
      }
+      dev->kbdfeed = NULL;
+  }
  #ifdef DEBUG
  fprintf(stderr, "nxagentFreeKeyboardDeviceData: Freed device data.\n");