usb: fotg210-udc: fix error return code in fotg210_udc_probe()

After commit  5f217ccd ("fotg210-udc: Support optional external PHY"),
the error code is re-assigned to 0 in fotg210_udc_probe(), if allocate or
map memory fails after the assignment, it can't return an error code. Set
the error code to -ENOMEM to fix this problem.

Fixes: 5f217ccd ("fotg210-udc: Support optional external PHY")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221230065427.944586-1-yangyingliang@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/fotg210/fotg210-udc.c

@@ -1201,6 +1201,8 @@ int fotg210_udc_probe(struct platform_device *pdev)
 		dev_info(dev, "found and initialized PHY\n");
 	}
 
+	ret = -ENOMEM;
+
 	for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
 		fotg210->ep[i] = kzalloc(sizeof(struct fotg210_ep), GFP_KERNEL);
 		if (!fotg210->ep[i])