VSOCK: fix returnvar.cocci warnings

Remove unneeded variable used to store return value.

Generated by: scripts/coccinelle/misc/returnvar.cocci

CC: Asias He <asias@redhat.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NJulia Lawall <julia.lawall@lip6.fr>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/vhost/vsock.c

@@ -56,8 +56,7 @@ struct vhost_vsock {
 
 static u32 vhost_transport_get_local_cid(void)
 {
-	u32 cid = VHOST_VSOCK_DEFAULT_HOST_CID;
-	return cid;
+	return VHOST_VSOCK_DEFAULT_HOST_CID;
 }
 
 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)