raspberrypi: PDMIn: Free resources when failing to construct.

This ensures that after using an invalid sample rate, the pin objects
and pio object are deinitialized.

Author: jepler

ports/raspberrypi/common-hal/audiobusio/PDMIn.c

@@ -65,6 +65,7 @@ void common_hal_audiobusio_pdmin_construct(audiobusio_pdmin_obj_t *self,
         PIO_MOV_STATUS_DEFAULT, PIO_MOV_N_DEFAULT);
     uint32_t actual_frequency = common_hal_rp2pio_statemachine_get_frequency(&self->state_machine);
     if (actual_frequency < 2 * MIN_MIC_CLOCK) { // 2 PIO samples per audio clock
+        common_hal_audiobusio_pdmin_deinit(self);
         mp_raise_ValueError(MP_ERROR_TEXT("sampling rate out of range"));
     }