errorHandler in -[EMSession sendTransaction:errorHandler:] crashes

[rcbello]

code in EMSession lines 86-99 passes the wrong error variable when error is caused by an invalid http status code, causing a crash on the errorHandler if the code access the error variable.

   // Parse response
      NSError *err = nil;
      NSInteger code = ((NSHTTPURLResponse *)response).statusCode;
      if (code != 200) {
          NSString *message = [NSString
              stringWithFormat:@"Unexpected http status code %ld", (long)code];
          ELOG(@"%@", message);
          NSDictionary *d = @{NSLocalizedDescriptionKey : message};
          err = [NSError errorWithDomain:EMErrorDomain
                                    code:EMErrorBadHTTPStatus
                                userInfo:d];
          errorHandler(error);
          return;
      }

variable passed to errorHandler should be err not error