fixed signed/unsigned mismatch and unused variable
fixed signed/unsigned mismatch and unused variable

capturePointer/vigra,hmeine/vigra,martinsch/vigra,psteinb/vigra,dstoe/vigra,kod3r/vigra,hmeine/vigra,mmuellner/vigra,dagophil/vigra,stuarteberg/vigra,cha007/vigra,timoMa/vigra,dstoe/vigra,ThomasWalter/vigra,cbecker/vigra,kod3r/vigra,timoMa/vigra,timoMa/vigra,dstoe/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,mmuellner/vigra,kod3r/vigra,capturePointer/vigra,ThomasWalter/vigra,DaveRichmond-/vigra,mmuellner/vigra,capturePointer/vigra,funkey/vigra,xiwei-zhang/vigra,capturePointer/vigra,xiwei-zhang/vigra,martinsch/vigra,martinsch/vigra,funkey/vigra,cbecker/vigra,stuarteberg/vigra,dstoe/vigra,cha007/vigra,cha007/vigra,ThomasWalter/vigra,psteinb/vigra,mmuellner/vigra,dstoe/vigra,dstoe/vigra,xiwei-zhang/vigra,psteinb/vigra,timoMa/vigra,cha007/vigra,psteinb/vigra,psteinb/vigra,DaveRichmond-/vigra,hmeine/vigra,mmuellner/vigra,xiwei-zhang/vigra,hmeine/vigra,kod3r/vigra,cbecker/vigra,xiwei-zhang/vigra,ThomasWalter/vigra,martinsch/vigra,hmeine/vigra,timoMa/vigra,cha007/vigra,cha007/vigra,stuarteberg/vigra,stuarteberg/vigra,dagophil/vigra,cbecker/vigra,stuarteberg/vigra,dagophil/vigra,ThomasWalter/vigra,kod3r/vigra,cbecker/vigra,DaveRichmond-/vigra,funkey/vigra,kod3r/vigra,xiwei-zhang/vigra,kod3r/vigra,funkey/vigra,DaveRichmond-/vigra,psteinb/vigra,timoMa/vigra,DaveRichmond-/vigra,martinsch/vigra,funkey/vigra,funkey/vigra,dagophil/vigra,DaveRichmond-/vigra,martinsch/vigra,dagophil/vigra,stuarteberg/vigra,cha007/vigra,DaveRichmond-/vigra,mmuellner/vigra,dstoe/vigra,stuarteberg/vigra,hmeine/vigra,timoMa/vigra,psteinb/vigra,cbecker/vigra,capturePointer/vigra,capturePointer/vigra,capturePointer/vigra,hmeine/vigra,mmuellner/vigra,dagophil/vigra,dagophil/vigra,ThomasWalter/vigra,funkey/vigra