USB: serial: add macro for console error reporting
Add macro which prints an error message only once if port is used a console. Reporting errors in a write path when port is used as a console could otherwise result in an infinite loop. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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