On close destruct the list of free request only if it was initialized.

This commit was SVN r1295.

src/mca/ptl/self/src/ptl_self_module.c

@@ -114,9 +114,10 @@ int mca_ptl_self_module_close(void)
             mca_ptl_self_module.self_send_requests.super.ompi_list_length);
     }
 
-    if (NULL != mca_ptl_self_module.self_ptls)
+    if (NULL != mca_ptl_self_module.self_ptls) {
         free(mca_ptl_self_module.self_ptls);
         OBJ_DESTRUCT( &(mca_ptl_self_module.self_send_requests) );
+    }
     return OMPI_SUCCESS;
 }