[ossia-pd] crashes when more than 1 oscquery client connected

[avilleret]

to reproduce :

• open https://github.com/OSSIA/libossia/blob/master/OSSIA/ossia-pd/examples/device-example.pd
• open https://github.com/OSSIA/libossia/blob/master/OSSIA/ossia-pd/examples/client-example.pd
• open https://github.com/OSSIA/libossia/blob/master/OSSIA/ossia-pd/examples/client-example.html

on the web page, change the modgain parameter then change it on client patcher kaboum ! crash with this backtrace :

https://gist.github.com/avilleret/98f34ad43ce32ef2149d3f157ff58d14

on Archlinux

[avilleret]

this seems to be fixed now