usb: dwc3: don't log probe deferrals; but do log other error codes

It's not very useful to repeat a bunch of probe deferral errors. And
it's also not very useful to log "failed" without telling the error
code.

Signed-off-by: Brian Norris <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/dwc3/core.c

···
 
 	ret = dwc3_core_init(dwc);
 	if (ret) {
-		dev_err(dev, "failed to initialize core\n");
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "failed to initialize core: %d\n", ret);
 		goto err4;
 	}