staging: unisys: Change alloc calls to use var name instead of type in virthba.c

This patch changes a couple of kzalloc calls to pass the variable name to the
call, rather than the variable struct type.  This is a result of checks
generated during 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>