devices/bsimsoi/b4soidest.c, fix commit: "OpenMP for B4SOI version 4.3.1"

> commit 39c98ad798
> Date:   Fri Jul 2 09:35:05 2010 +0000
>
>     OpenMP for B4SOI version 4.3.1

src/spicelib/devices/bsimsoi/b4soidest.c

@@ -24,6 +24,11 @@ B4SOIdestroy(GENmodel **inModel)
 {
     B4SOImodel *mod = *(B4SOImodel**) inModel;
 
+#ifdef USE_OMP
+    /* free just once for all models */
+    FREE(mod->B4SOIInstanceArray);
+#endif
+
     while (mod) {
         B4SOImodel *next_mod = mod->B4SOInextModel;
         B4SOIinstance *inst = mod->B4SOIinstances;