Fix mutex lock/unlock

[Chris Brannon]

Samuel Thibault <samuel.thibault at ens-lyon.org> writes:

> Hello,
>
>> > While looking at the speakup source code I noticed a missing
>> > mutex_lock/unlock pair, please see the attached patch.
>> 
>> Which version were you looking at?  The master branch of espeakup on
>> github?  This patch does not apply to it at all.
>
> I'm looking at https://github.com/williamh/espeakup/blob/master/signal.c
> Is there another repository?

Sorry, this patch does apply after all; my mistake.
I agree that it needs to go in.

-- Chris