serial: kill USF_CLOSING_* definitions
The serial layer for some reason uses different defines for the special case close delays and then conditionally switches to/from the normal ones in the ioctls. Remove this rather pointless abstraction Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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