This silence a warning brought up by valgrind whenever if_nametoindex is used. This was already discussed in PR 166483, but the code committed in r234329 guards the initilization with #ifdef PURIFY. Therefore, valgrind still complains. Since this code is not performance critical, always zero out the local variable to silence valgrind. PR: 166483 Discussed with: eadler@ MFC after: 4 weeks