Use existing, pre-defined empty name

Grabbing a pointer to "" looks suspicious. Quick search didn't make it
any clearer - some forums suggest it would be a pointer to stack, others
it would point to heap, depending on compiler optimizations.
To make things clean and easy, use existing empty name holder.

Bug: None
Flag: exempt, trivial fix.
Test: compilation
Change-Id: I63036c11962372c2c11f4a16867f90dc25dbf60f