Fix shadowing issue reported by go vet (#5590)
Fix shadowing issue reported by go vet (#5590)


harshavardhana/minio,rushenn/minio,minio/minio,NitishT/minio,fwessels/minio,fwessels/minio,harshavardhana/minio,jimjag/minio,krisis/minio,harshavardhana/minio,rushenn/minio,balamurugana/minio,vadmeste/minio,donatello/minio,aead/minio,aead/minio,aead/minio,harshavardhana/minio,vadmeste/minio,balamurugana/minio,rushenn/minio,krishnasrinivas/minio,harshavardhana/minio,abperiasamy/minio,NitishT/minio,harshavardhana/minio,fwessels/minio,aead/minio,jimjag/minio,NitishT/minio,minio/minio,krishnasrinivas/minio,abperiasamy/minio,rushenn/minio,harshavardhana/minio,krishnasrinivas/minio,aead/minio,fwessels/minio,krisis/minio,donatello/minio,abperiasamy/minio,jimjag/minio,jimjag/minio,abperiasamy/minio,harshavardhana/minio,aead/minio,NitishT/minio,aead/minio,krishnasrinivas/minio,aead/minio