upeke2: Fix build-time warnings
upeke2: Fix build-time warnings

Fix warnings reported by gcc

https://bugs.freedesktop.org/show_bug.cgi?id=56439

freedesktop-unofficial-mirror/libfprint__libfprint,yingted/etes603,zemen/libfprint,micw/libfprint,PDXostc/libfprint,rmarku/libfprint,iafilatov/libfprint,micw/libfprint,payden/libfprint,jipumarino/libfprint,micw/libfprint,abhishekgahlot/fprint-bsapi,FabriceSalvaire/libfprint-baspi,sbambrough/libfprint_extended,abhishekgahlot/libfprint,abhishekgahlot/libfprint,anarsoul/libfprint,freedesktop-unofficial-mirror/libfprint__libfprint,FabriceSalvaire/libfprint-baspi,abhishekgahlot/fprint-bsapi,abhishekgahlot/libfprint,Gnate/libfprint,sbambrough/libfprint_extended,yingted/etes603,rmarku/libfprint,Gnate/libfprint,ccsystems/libfprint,zOrg1331/libfprint,zOrg1331/libfprint,yingted/etes603,payden/libfprint,anarsoul/libfprint,freedesktop-unofficial-mirror/libfprint__libfprint,hyperair/fprint-bsapi,jipumarino/libfprint,ccsystems/libfprint,PDXostc/libfprint,rmarku/libfprint,payden/libfprint,FabriceSalvaire/libfprint-baspi,jipumarino/libfprint,hyperair/fprint-bsapi,hyperair/fprint-bsapi,Gnate/libfprint,zemen/libfprint,ccsystems/libfprint,PDXostc/libfprint,zemen/libfprint,sbambrough/libfprint_extended,zOrg1331/libfprint,abhishekgahlot/fprint-bsapi