Fix a warning from -Wshadow (#627)
Fix a warning from -Wshadow (#627)

Variable "it" was shadowed
jbeder/yaml-cpp,dand-oss/yaml-cpp,WrinklyNinja/yaml-cpp,jbeder/yaml-cpp,jbeder/yaml-cpp,loot/yaml-cpp,WrinklyNinja/yaml-cpp,loot/yaml-cpp,dand-oss/yaml-cpp,graehl/yaml-cpp,WrinklyNinja/yaml-cpp,graehl/yaml-cpp,loot/yaml-cpp,graehl/yaml-cpp,dand-oss/yaml-cpp,jbeder/yaml-cpp,dand-oss/yaml-cpp,tangrams/yaml-cpp,WrinklyNinja/yaml-cpp,tangrams/yaml-cpp,tangrams/yaml-cpp,graehl/yaml-cpp,dand-oss/yaml-cpp,tangrams/yaml-cpp,loot/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp