prism54: bug in getting auth type

There is a missing break statement so SHARED_KEY authentication doesn't
work.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/prism54/isl_ioctl.c

@@ -1503,6 +1503,7 @@ static int prism54_get_auth(struct net_device *ndev,
 			case DOT11_AUTH_BOTH:
 			case DOT11_AUTH_SK:
 				param->value = IW_AUTH_ALG_SHARED_KEY;
+				break;
 			case DOT11_AUTH_NONE:
 			default:
 				param->value = 0;