sh,sh-sci: Use NO_POLL_CHAR in the SCIF polled console code
The sci_poll_get_char() needs to return immediately if there is no input from the chip to process, and must return a value of NO_POLL_CHAR. This allows kgdboc to process multiple polled devices while kgdb is active. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Acked-by: NPaul Mundt <lethal@linux-sh.org>
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