dtrace: operands have incompatible types: "dmu_buf_t **" = "dmu_buf_t **"

[Andriy Gapon]

For your amusement:

============= testcase.d =============
dmu_buf_t **buf;
/* Remove the following line to defuse. */
bpobj_t *bpobj;

fbt::dmu_bonus_hold:entry
{
	buf = args[3]; /* the error is about this line */
}
=======================================

I think I know what's going on, but I am still making sure that that's true.

-- 
Andriy Gapon