serial: 68328serial: Use NULL for pointers
Compare pointer-typed values to NULL rather than 0 The semantic patch that makes this change is available in scripts/coccinelle/null/badzero.cocci. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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