[aarch64] Fixes CLI crashes on dpaa2 platform.

- always use 'va_args' as pointer in all format_* functions
- u32 for all 'indent' params as it's declaration was inconsistent

Change-Id: Ic5799309a6b104c9b50fec309cba789c8da99e79
Signed-off-by: Christophe Fontaine <christophe.fontaine@enea.com>
diff --git a/src/vnet/dpo/mpls_label_dpo.c b/src/vnet/dpo/mpls_label_dpo.c
index 2a6e7dd..c6e8dcc 100644
--- a/src/vnet/dpo/mpls_label_dpo.c
+++ b/src/vnet/dpo/mpls_label_dpo.c
@@ -550,7 +550,7 @@
     CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
     mpls_label_imposition_trace_t * t;
     mpls_unicast_header_t hdr;
-    uword indent;
+    u32 indent;
 
     t = va_arg (*args, mpls_label_imposition_trace_t *);
     indent = format_get_indent (s);