backends/bluezdbus/manager: Release resources on bus restart

Call disconnect() on the old bus object if we have to reconnect to the
D-Bus system bus. This ensures that file handles are released and we
don't leak them.

Author: dlech

CHANGELOG.rst

@@ -10,6 +10,10 @@ and this project adheres to `Semantic Versioning <https://semver.org/spec/v2.0.0
 `Unreleased`_
 =============
 
+Fixed
+-----
+- Fixed file handle leak in BlueZ backend when D-Bus connection is lost and re-established.
+
 `1.1.1`_ (2025-09-07)
 =====================
 

bleak/backends/bluezdbus/manager.py

@@ -350,6 +350,11 @@ async def async_init(self) -> None:
                 bus.disconnect()
                 raise
 
+            if self._bus:
+                # Even if we are disconnected, still need to call this to
+                # release file handles.
+                self._bus.disconnect()
+
             # Everything is setup, so save the bus
             self._bus = bus