Fix unsafe usage of the logging functions.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4905 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/win/rfb_win32/RegConfig.cxx b/win/rfb_win32/RegConfig.cxx
index 90980c3..30cb310 100644
--- a/win/rfb_win32/RegConfig.cxx
+++ b/win/rfb_win32/RegConfig.cxx
@@ -48,7 +48,7 @@
     processEvent(event);
     return true;
   } catch (rdr::Exception& e) {
-    vlog.debug(e.str());
+    vlog.debug("%s", e.str());
     return false;
   }
 }
@@ -65,7 +65,7 @@
     }
   } catch (rdr::SystemException& e) {
     if (e.err != 6)
-      vlog.error(e.str());
+      vlog.error("%s", e.str());
   }
 }