tty: serial: 8250_mtk: Use PTR_ERR_OR_ZERO
Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR Signed-off-by: NHimanshu Jha <himanshujha199640@gmail.com> Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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