{
int rv;
- if (synth->read_buff_add == NULL)
+ if (!synth->read_buff_add)
return;
rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
if (speakup_info.port_tts == 0)
return;
- if (synth->read_buff_add == NULL)
+ if (!synth->read_buff_add)
return;
/* Turn off interrupts */