mfd: omap-usb-host: Return value is not 'const int'

Change from 'const int' to just 'int'.

Cc: <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/omap-usb-host.c

···
  * provided port mode string as per the port_modes table.
  * If no match is found it returns -ENODEV
  */
-static const int omap_usbhs_get_dt_port_mode(const char *mode)
+static int omap_usbhs_get_dt_port_mode(const char *mode)
 {
 	int i;