SecureSocket: avoid crash on close

Deleting the BIO while it's still waiting on a read() in another thread
will lead to a crash when the socket is eventually closed. Close the
socket first, so the read() is unlocked, then safely delete the BIO.

src/kits/network/libnetapi/SecureSocket.cpp

@@ -107,12 +107,15 @@ BSecureSocket::Disconnect()
 			SSL_CTX_free(fPrivate->fCTX);
 			fPrivate->fCTX = NULL;
 		}
+
+		BSocket::Disconnect();
+			// Must do this before freeing the BIO, to make sure any pending
+			// read or write gets unlocked properly.
 		if (fPrivate->fBIO != NULL) {
 			BIO_free(fPrivate->fBIO);
 			fPrivate->fBIO = NULL;
 		}
 	}
-	return BSocket::Disconnect();
 }