Fix jsHint warnings

lib/gltf.js

@@ -333,7 +333,7 @@ function createGltf(data, inputPath, modelName, done) {
                 throw err;
             }
             done(gltf);
-        })
+        });
     } else {
         done(gltf);
     }

lib/obj.js

@@ -293,7 +293,7 @@ function getMaterials(mtlPath, hasMaterialGroups, done) {
 }
 
 function getObjInfo(objFile, inputPath, done) {
-    var mtlPath = undefined;
+    var mtlPath;
     var hasMaterialGroups = false;
     var hasPositions = false;
     var hasNormals = false;