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 +11 -7

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--- a/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
+++ b/nx-X11/programs/Xserver/hw/nxagent/Keyboard.c
@@ -1327,14 +1327,18 @@ static int nxagentFreeKeyboardDeviceData(DeviceIntPtr dev)
      dev->focus = NULL;
  }

-  for (k = dev->kbdfeed; k; k = knext)
+  if (dev->kbdfeed)
  {
-      knext = k->next;
-      #ifdef XKB
-      if (k->xkb_sli)
-          XkbFreeSrvLedInfo(k->xkb_sli);
-      #endif
-      free(k);
+      for (k = dev->kbdfeed; k; k = knext)
+      {
+          knext = k->next;
+          #ifdef XKB
+          if (k->xkb_sli)
+              XkbFreeSrvLedInfo(k->xkb_sli);
+          #endif
+          free(k);
+      }
+      dev->kbdfeed = NULL;
  }

  #ifdef DEBUG