Add protections against queueing a UsbRequest when the underlying UsbDeviceConnection is closed.

Bug: 204584366
Test: CTS Verifier: USB Accessory Test & USB Device Test
Test: No HWASan use-after-free reports with a test app
Change-Id: Ia3a9b10349efc0236b1539c81465f479cb32e02b
(cherry picked from commit 1691b54b1fda4239249a3871d2c17ed1ec753061)
Merged-In: Ia3a9b10349efc0236b1539c81465f479cb32e02b
2 files changed