Inline only use of TS_VERIFY_CTX_init()

Inline only use of TS_VERIFY_CTX_init()

Since TS_VERIFY_CTX is now opaque, the only thing TS_VERIFY_CTX_init()
is good for outside the library is memory leaks. Inside the library it's
also useless, since as a much more familiar name is memset(). It will soon
be able to join all the other nonsense that should never have leaked out of
this library.