libpq error message deallocation

PQerrorMessage function return char const*
char const* msg = PQerrorMessage(conn);
Now since it's const, I don't think I should be deallocating it and I've
never seen that done in any examples. But then, when and how does it get
freed?
At first I thought it gets deallocated once another error message is
requested but that's not the case.
// cause some error char const* msg1 = PQerrorMessage(pgconn); //
cause another error char const* msg2 = PQerrorMessage(pgconn); //
still works std::cout << msg1 << msg2 << std::endl;
Can someone shed some light on this for me?

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