added braces to suppress g++ 4.3 warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55553 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/archive/archivetest.cpp

@@ -269,10 +269,12 @@ size_t TestInputStream::OnSysRead(void *buffer, size_t size)
     }
 
     if (((m_eoftype & AtLast) != 0 && m_pos >= m_size) || count < size)
+    {
         if ((m_eoftype & WithError) != 0)
             m_lasterror = wxSTREAM_READ_ERROR;
         else
             m_lasterror = wxSTREAM_EOF;
+    }
 
     return count;
 }