staging: unisys: virtpci: Remove space between cast and variable

Remove the whitespace between a cast and a variable in virtpci.c.

Signed-off-by: Bryan Thompson <bryan.thompson@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>