usb: gadget: xudc: Remove redundant platform_get_irq error message

platform_get_irq() will call dev_err() itself on failure,
so there is no need for the driver to also do this.
This is detected by coccinelle.

Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>