kopete: Fix crash due to null pointer dereference in IRC protocol.

This manifests itself only if SSL/TLS is used for IRC.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 71415aad02)

kopete/protocols/irc/libkirc/ksslsocket.cpp

@@ -103,7 +103,7 @@ int KSSLSocket::peekBlock( char* data, uint maxLen )
 
 TQ_LONG KSSLSocket::writeBlock( const char* data, TQ_ULONG len )
 {
-	return d->kssl->write( data, len );
+	return d->kssl ? (d->kssl->write(data, len)) : -1;
 }
 
 #ifdef USE_QT4