USB: oti6858: fix TCFLSH ioctl handling
Removes unimplemented TCFLSH handling from oti6858, because it was preventing TCFLSH handling by upper layer (line discipline) drivers (see drivers/char/tty_io.c line 3450). Signed-off-by: NPaulius Zaleckas <paulius.zaleckas@teltonika.lt> Acked-by: NAlan Cox <alan@redhat.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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