fix misuse of file test operator
fix misuse of file test operator

dankogai/roast,cygx/roast,niner/roast,laben/roast,dankogai/roast,b2gills/roast,cygx/roast,skids/roast,b2gills/roast,zostay/roast,cygx/roast,perl6/roast,zostay/roast,laben/roast,skids/roast,dogbert17/roast,dankogai/roast,niner/roast,skids/roast,zostay/roast,niner/roast,bitrauser/roast,b2gills/roast,laben/roast,bitrauser/roast,dogbert17/roast