staging: unisys: iochannel fix spacing around operators

This patch fixes check warning from checkpatch.pl in the macro definition
CHECK: spaces preferred around that '+' (ctx:VxV)

Signed-off-by: Erik Arfvidson <erik.arfvidson@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>