usb: dwc3: debugfs: when unknown, print only the state value

whenever we grab an unknown link_state we
were printing the entire register value as
a integer but that's hardly useful; instead,
let's print only the bogus state value.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/debugfs.c

@@ -584,7 +584,7 @@ static int dwc3_link_state_show(struct seq_file *s, void *unused)
 		seq_printf(s, "Resume\n");
 		break;
 	default:
-		seq_printf(s, "UNKNOWN %d\n", reg);
+		seq_printf(s, "UNKNOWN %d\n", state);
 	}
 
 	return 0;