lkdtm: cfi: use NULL for a null pointer rather than zero
There is a pointer being initialized with a zero, use NULL instead. Cleans up sparse warning: drivers/misc/lkdtm/cfi.c:100:27: warning: Using plain integer as NULL pointer Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Link: https://lore.kernel.org/r/20220612202708.2754270-1-colin.i.king@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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