Bluetooth: L2CAP: Fix attempting to access uninitialized memory

Bluetooth: L2CAP: Fix attempting to access uninitialized memory

Origin: https://git.kernel.org/linus/b1a2cd50c0357f243b7435a732b4e62ba3157a2e
Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2022-42895

On l2cap_parse_conf_req the variable efs is only initialized if
remote_efs has been set.

CVE: CVE-2022-42895
CC: stable@vger.kernel.org
Reported-by: Tamás Koczka <poprdi@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reviewed-by: Tedd Ho-Jeong An <tedd.an@intel.com>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name Bluetooth-L2CAP-Fix-attempting-to-access-uninitializ.patch