spandsp: Set empty patches array
spandsp: Set empty patches array

By not setting an empty patches array, we endup with the patches
being randomly applied to other recipies.

https://bugzilla.gnome.org/show_bug.cgi?id=754997

OptoFidelity/cerbero,flexVDI/cerbero,centricular/cerbero,shoreflyer/cerbero,OptoFidelity/cerbero,centricular/cerbero,shoreflyer/cerbero,OptoFidelity/cerbero,nirbheek/cerbero,multipath-rtp/cerbero,multipath-rtp/cerbero,sdroege/cerbero,justinjoy/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,justinjoy/cerbero,nirbheek/cerbero,multipath-rtp/cerbero,nirbheek/cerbero,atsushieno/cerbero,atsushieno/cerbero,atsushieno/cerbero,multipath-rtp/cerbero,flexVDI/cerbero,sdroege/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero,sdroege/cerbero,multipath-rtp/cerbero,OptoFidelity/cerbero,justinjoy/cerbero,fluendo/cerbero,GStreamer/cerbero,shoreflyer/cerbero,fluendo/cerbero,centricular/cerbero,EricssonResearch/cerbero,centricular/cerbero,GStreamer/cerbero,justinjoy/cerbero,atsushieno/cerbero,fluendo/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,atsushieno/cerbero,fluendo/cerbero,EricssonResearch/cerbero,centricular/cerbero,shoreflyer/cerbero,sdroege/cerbero,flexVDI/cerbero,nirbheek/cerbero,flexVDI/cerbero,sdroege/cerbero,EricssonResearch/cerbero