c: make type of conditional expr with pointers match non void pointer

Here's what the C standard[1] says about the conditional operator:

```
if one operand is a null pointer constant, the result has the type of
the other operand; otherwise, one operand is a pointer to void or a
qualified version of void, in which case the result type is a
pointer to an appropriately qualified version of void.
``

But actually, some codebases rely on things like 'x ? &foo.memb : NULL'
to have the type of `&foo.memb`, and not `void *`...

[1]: ISO/IEC 9899:TC3 §6.5.15

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