staging: dgrp: check for NULL pointer in (un)register_proc_table
register_proc_table and unregister_proc_table didn't deal with the possibility that the *table pointer could be NULL. Check for this and return if table is NULL. Reported-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NBill Pemberton <wfp5p@virginia.edu> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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