Fix incorrect order of operations.

tests/pio_write.c

@@ -327,9 +327,9 @@ main(int argc, char *argv[])
 
 #ifdef USE_MPI
     }
+  pioFinalize();
   namespaceSetActive(initNamespace);
   cdiPioConfDestroy(pioConfHandle);
-  pioFinalize();
   xt_finalize();
   MPI_Finalize();
 #endif