Add va_end to make cppcheck happy

sql/rpl_reporting.cc

@@ -57,6 +57,7 @@ Slave_reporting_capability::report(loglevel level, int err_code,
     report_function= sql_print_information;
     break;
   default:
+    va_end(args);
     DBUG_ASSERT(0);                            // should not come here
     return;          // don't crash production builds, just do nothing
   }