fix compiler warning about use of uninitialized stucture
fix compiler warning about use of uninitialized stucture

* added initialization of precision ( 0 => use sass default precision )

saper/libsass,khchanel/libsass,webdev1001/libsass,khchanel/libsass,panicinc/libsass,khchanel/libsass,TBAPI-0KA/NSass,mikebarkas/libsass,mikebarkas/libsass,panicinc/libsass,mikebarkas/libsass,webdev1001/libsass,technoAri/libsass,am11/libsass,TBAPI-0KA/NSass,TBAPI-0KA/NSass,moovweb/libsass,technoAri/libsass,dahlia/libsass-python,mtwebster/mint-libsass,am11/libsass,mikebarkas/libsass,TBAPI-0KA/NSass,mtwebster/mint-libsass,errorx666/libsass,errorx666/libsass,panicinc/libsass,FishingCactus/libsass,saper/libsass,FishingCactus/libsass,TBAPI-0KA/NSass,webdev1001/libsass,mtwebster/mint-libsass,mtwebster/mint-libsass,panicinc/libsass,am11/libsass,technoAri/libsass,admire93/libsass-python,errorx666/libsass,khchanel/libsass,am11/libsass,khchanel/libsass,panicinc/libsass,moovweb/libsass,moovweb/libsass,webdev1001/libsass,FishingCactus/libsass,webdev1001/libsass,TBAPI-0KA/NSass,dahlia/libsass-python,FishingCactus/libsass,mikebarkas/libsass,admire93/libsass-python,saper/libsass,moovweb/libsass,errorx666/libsass,am11/libsass,technoAri/libsass,saper/libsass,technoAri/libsass,FishingCactus/libsass,mtwebster/mint-libsass,saper/libsass