Fixes compile error when CONFIG_PM=n is set

--- a/drivers/net/wireless/p54/p54usb.c
+++ b/drivers/net/wireless/p54/p54usb.c
@@ -919,9 +919,11 @@ static int __devinit p54u_probe(struct u
 	priv->common.open = p54u_open;
 	priv->common.stop = p54u_stop;
 	if (recognized_pipes < P54U_PIPE_NUMBER) {
+#ifdef CONFIG_PM
 		/* ISL3887 needs a full reset on resume */
 		udev->reset_resume = 1;
 		err = p54u_device_reset(dev);
+#endif
 
 		priv->hw_type = P54U_3887;
 		dev->extra_tx_headroom += sizeof(struct lm87_tx_hdr);