gc all pointers in hid_devices properly

Author: dhalbert

shared-module/usb_hid/__init__.c

@@ -257,9 +257,11 @@ void usb_hid_save_report_descriptor(uint8_t *report_descriptor_space, size_t rep
 void usb_hid_gc_collect(void) {
     gc_collect_ptr(hid_devices_tuple);
 
-    // Mark any heap pointers in the static device list as in use.
+    // Mark possible heap pointers in the static device list as in use.
     for (mp_int_t i = 0; i < hid_devices_num; i++) {
-        gc_collect_ptr(&hid_devices[i]);
+        gc_collect_ptr(&hid_devices[i].report_descriptor);
+        gc_collect_ptr(&hid_devices[i].in_report_buffer);
+        gc_collect_ptr(&hid_devices[i].out_report_buffer);
     }
 }