USB: u132-hcd.c - Fix a warning when CONFIG_PM=n

I noticed this warning with CONFING_PM=n 

...

drivers/usb/host/u132-hcd.c:1525: warning: 'port_power' defined but not used

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Signed-off-by: Gabriel Craciunescu <nix.or.die@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/u132-hcd.c

@@ -1520,12 +1520,15 @@ static void u132_hcd_endp_work_scheduler(struct work_struct *work)
                 }
         }
 }
+#ifdef CONFIG_PM
 
 static void port_power(struct u132 *u132, int pn, int is_on)
 {
         u132->port[pn].power = is_on;
 }
 
+#endif
+
 static void u132_power(struct u132 *u132, int is_on)
 {
         struct usb_hcd *hcd = u132_to_hcd(u132)