fix build on rp2040

Author: jepler

ports/raspberrypi/common-hal/usb_host/Port.c

@@ -127,8 +127,8 @@ usb_host_port_obj_t *common_hal_usb_host_port_construct(const mcu_pin_obj_t *dp,
     assert_pin_free(dp);
     assert_pin_free(dm);
 
-    #if PICO_PIO_VERSION > 0
-    uint32_t used_gpio_ranges = 0;
+    #if PICO_PIO_VERSION == 0
+    uint32_t required_gpio_ranges = 0;
     #else
     uint gpio_base = dm->number;
     uint gpio_count = 2;