Fix warning in clang 3.5 (-Wabsolute-value)
Fix warning in clang 3.5 (-Wabsolute-value)

foresterre/wren,munificent/wren,munificent/wren,Nelarius/wren,Rohansi/wren,munificent/wren,bigdimboom/wren,foresterre/wren,Nave-Neel/wren,Rohansi/wren,Nave-Neel/wren,minirop/wren,bigdimboom/wren,Nave-Neel/wren,foresterre/wren,Rohansi/wren,munificent/wren,bigdimboom/wren,minirop/wren,foresterre/wren,minirop/wren,foresterre/wren,Nave-Neel/wren,minirop/wren,Nelarius/wren,Rohansi/wren,Nelarius/wren,bigdimboom/wren,minirop/wren,munificent/wren,munificent/wren,Nelarius/wren,Nelarius/wren