Use NULL instead of 0 for pointer arguments of CallStaticVoidMethod.

CallStaticVoidMethod is varargs function, and calling it with
a literal 0 like CallStaticVoidMethod(..., 0) will treat the
argument as a 4 byte int in both 32 and 64 bit processes.

This is incorrect for pointer arguments where NULL should be
used instead.

Reviewed-by: Liao, Bruce <bruce.liao@intel.com>
Signed-off-by: Yong Yao <yong.yao@intel.com>

Change-Id: I9d700d3790a80dbee6826f64baf9ef5d81ca390f