btl/usnic: assign the number of send credit correctly.

usnic endpoints was always created with default send credit value of 8. This
commit assign the correct number from the hardware instead.

Signed-off-by: Thananon Patinyasakdikul <apatinya@cisco.com>

opal/mca/btl/usnic/btl_usnic_proc.c

@@ -741,6 +741,7 @@ opal_btl_usnic_create_endpoint(opal_btl_usnic_module_t *module,
     endpoint->endpoint_module = module;
     assert(modex_index >= 0 && modex_index < (int)proc->proc_modex_count);
     endpoint->endpoint_remote_modex = proc->proc_modex[modex_index];
+    endpoint->endpoint_send_credits = module->sd_num;
 
     /* Start creating destinations; one for each channel.  These
        progress in the background.a */