DRTVWR-476: Fix LLError::Log::classname(T*) template function.

First, the signature classname(const T*) was wrong: that function could only
accept a pointer to const T. The expression classname(someptr) where someptr
was a pointer to non-const SomeType displayed "SomeType*" because it could
only match classname(const T&), where T was SomeType*.

classname(T* const) is what we should have written, meaning "const pointer to
T" rather than "pointer to const T."

Second, the previous implementation failed to handle the case in which the
pointer was nullptr.

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