[SERIAL] returning proper error from serial core driver
Fix the issue of returning 0 even in case of error from uart_set_info function. Now it returns the error EBUSY when it can not set new port. Signed-off-by: NRam Gupta <r.gupta@astronautics.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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