mesh: Fix clang uninitialized var warning
mesh: Fix clang uninitialized var warning

There's a BT_DBG that will output the value of pub_addr before its ever
set to anything.  Remove output of pub_addr from BT_DBG().

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble