USB: serial: mct_u232: clean up urb->status usage
This done in anticipation of removal of urb->status, which will make
that patch easier to review and apply in the future.
Cc: <linux-usb-devel@lists.sourceforge.net>
Cc: Wolfgang Grandegger <wolfgang@ces.ch>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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