vlib: fix coverity warning
Remove now unused computation result.
Type: fix
Fixes:
@@ -564,7 +564,6 @@ show_node_runtime (vlib_main_t * vm,
n_clocks += l;
v = n->stats_total.vectors - n->stats_last_clear.vectors;
- c = n->stats_total.calls - n->stats_last_clear.calls;
switch (n->type)
{
