core: fix visibility of apps.common.device.U2F_COUNTER

core/src/apps/common/storage/__init__.py

@@ -27,9 +27,9 @@ def init_unlocked() -> None:
 def _migrate_from_version_01() -> None:
     # Make the U2F counter public and writable even when storage is locked.
     # U2F counter wasn't public, so we are intentionally not using storage.device module.
-    counter = common._get(common._APP_DEVICE, device._U2F_COUNTER)
+    counter = common._get(common._APP_DEVICE, device.U2F_COUNTER)
     if counter is not None:
         device.set_u2f_counter(int.from_bytes(counter, "big"))
         # Delete the old, non-public U2F_COUNTER.
-        common._delete(common._APP_DEVICE, device._U2F_COUNTER)
+        common._delete(common._APP_DEVICE, device.U2F_COUNTER)
     set_current_version()

core/src/apps/common/storage/device.py

@@ -22,7 +22,7 @@ _USE_PASSPHRASE            = const(0x05)  # bool (0x01 or empty)
 _HOMESCREEN                = const(0x06)  # bytes
 _NEEDS_BACKUP              = const(0x07)  # bool (0x01 or empty)
 _FLAGS                     = const(0x08)  # int
-_U2F_COUNTER               = const(0x09)  # int
+U2F_COUNTER                = const(0x09)  # int
 _PASSPHRASE_SOURCE         = const(0x0A)  # int
 _UNFINISHED_BACKUP         = const(0x0B)  # bool (0x01 or empty)
 _AUTOLOCK_DELAY_MS         = const(0x0C)  # int
@@ -199,11 +199,11 @@ def set_autolock_delay_ms(delay_ms: int) -> None:
 
 
 def next_u2f_counter() -> Optional[int]:
-    return common._next_counter(_NAMESPACE, _U2F_COUNTER, True)  # writable when locked
+    return common._next_counter(_NAMESPACE, U2F_COUNTER, True)  # writable when locked
 
 
 def set_u2f_counter(count: int) -> None:
-    common._set_counter(_NAMESPACE, _U2F_COUNTER, count, True)  # writable when locked
+    common._set_counter(_NAMESPACE, U2F_COUNTER, count, True)  # writable when locked
 
 
 def set_slip39_identifier(identifier: int) -> None: