Keyboard.c: fix comment.

nx-X11/programs/Xserver/hw/nxagent/Keyboard.c

@@ -870,8 +870,7 @@ XkbError:
              * when cloning we do not want X2Go to set the keyboard
              * via a keyboard file generated by nxagent. The defined
              * method for switching that off is the creation of a dir
-             * instead of a file. Which is achieved by passing NULL to
-             * nxagentWriteKeyboardFile.
+             * instead of a file.
              */
             if (nxagentX2go == 1)
               nxagentWriteKeyboardDir();