staging: unisys: Remove unneeded spaces after casts in virthba.c

This patch removes all unnecessary spaces after casts, as reported by the
checkpatch script.

Signed-off-by: Ken Depro <kenneth.depro@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>