client session & io BUGFIX uninitialized variable

Only in RELEASE build, some optiomalizations probably.
diff --git a/src/session_client.c b/src/session_client.c
index 8fa4f03..7eb7e37 100644
--- a/src/session_client.c
+++ b/src/session_client.c
@@ -1216,7 +1216,7 @@
     struct nc_rpc_getschema *rpc_gs;
     struct nc_rpc_subscribe *rpc_sub;
     struct lyd_node *data, *node;
-    const struct lys_module *ietfnc, *ietfncmon, *notifs, *ietfncwd = NULL;
+    const struct lys_module *ietfnc = NULL, *ietfncmon, *notifs, *ietfncwd = NULL;
     char str[11];
     uint64_t cur_msgid;