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It's more readable to just pass NULL directly instead of using a variable for that. Link: https://lkml.kernel.org/r/Y/yAlDytLH0ZNLNz@kili Signed-off-by: Dan Carpenter <error27@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>