Only add path if necessary

matlab/JET/rda_jet.m

@@ -34,8 +34,9 @@ end
 if usemdsplus
   % use mdsplus
 
-  if exist('/home/amerle/codes/mds-ssh','dir')
-    addpath('/home/amerle/codes/mds-ssh')
+  mds_dir = '/home/amerle/codes/mds-ssh';
+  if exist(mds_dir,'dir') && ~strcmp(which('mdsipmex'),fullfile(mds_dir,'mdsipmex.mexa64'))
+    addpath(mds_dir);
   end
   mdsconnect(['ssh://' jet_user '@mdsplus.jetdata.eu']);
   mdsvalue('reset_public()');