Tidied up the control flow

Author: photonstorm

src/math/interpolation/LinearInterpolation.js

@@ -28,13 +28,14 @@ var LinearInterpolation = function (v, k)
     {
         return Linear(v[0], v[1], f);
     }
-
-    if (k > 1)
+    else if (k > 1)
     {
         return Linear(v[m], v[m - 1], m - f);
     }
-
-    return Linear(v[i], v[(i + 1 > m) ? m : i + 1], f - i);
+    else
+    {
+        return Linear(v[i], v[(i + 1 > m) ? m : i + 1], f - i);
+    }
 };
 
 module.exports = LinearInterpolation;