xen: remove redundant initialization of variable ret

After commit 9f51c05dc41a ("pvcalls-front: Avoid
get_free_pages(GFP_KERNEL) under spinlock"), the variable ret is being
initialized with '-ENOMEM' that is meaningless. So remove it.

Signed-off-by: Jing Xiangfeng <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Juergen Gross <[e-mail]>
Signed-off-by: Boris Ostrovsky <[e-mail]>

drivers/xen/pvcalls-front.c

···
 static int create_active(struct sock_mapping *map, evtchn_port_t *evtchn)
 {
 	void *bytes;
-	int ret = -ENOMEM, irq = -1, i;
+	int ret, irq = -1, i;
 
 	*evtchn = 0;
 	init_waitqueue_head(&map->active.inflight_conn_req);