picojson: fix warning.
picojson: fix warning.

renzodenardi/Pangolin,wxdzju/Pangolin,arpg/Pangolin,tschmidt23/Pangolin,randi120/Pangolin,tschmidt23/Pangolin,wxdzju/Pangolin,renzodenardi/Pangolin,tschmidt23/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,pinglin/Pangolin,randi120/Pangolin,arpg/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,pinglin/Pangolin,stevenlovegrove/Pangolin,mp3guy/Pangolin,visigoth/Pangolin,visigoth/Pangolin