We don't need to redeclare err

Author: mattrobenolt

lib/client.js

@@ -117,7 +117,7 @@ _.captureException = function captureError(err, kwargs, cb) {
         // This handles when someone does:
         //   throw "something awesome";
         // We synthesize an Error here so we can extract a (rough) stack trace.
-        var err = new Error(err);
+        err = new Error(err);
     }
 
     var self = this;