Fix equality check

Author: shana

src/GitHub.Exports/Primitives/HostAddress.cs

@@ -98,7 +98,7 @@ public override bool Equals(object obj)
             if (ReferenceEquals(this, obj))
                 return true;
             var other = obj as HostAddress;
-            return obj != null && other != null && WebUri.IsSameHost(other.WebUri) && ApiUri.IsSameHost(other.ApiUri);
+            return other != null && WebUri.IsSameHost(other.WebUri) && ApiUri.IsSameHost(other.ApiUri);
         }
     }
 }