ice: correct memory allocation call

Use *malloc() instead of *calloc() when allocating only a single object as
opposed to an array of objects.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>