fix travis

wrapper/xgboost_wrapper.cpp

@@ -181,14 +181,14 @@ const char *XGBSetGetLastError_(const char *str_set) {
 #else
 // crippled implementation for solaris case
 // exception handling is not needed for R, so it is OK.
-#define API_BEGIN() 
+#define API_BEGIN()
 #define API_END_FINALIZE(Finalize) return 0
 #define API_END() return 0
 
 const char *XGBSetGetLastError_(const char *str_set) {
   return NULL;
 }
-#endif
+#endif  // XGBOOST_STRICT_CXX98_
 
 /*! \brief return str message of the last error */
 const char *XGBGetLastError() {