Bluetooth: ISO: Clean up returns values in iso_connect_ind()

Bluetooth: ISO: Clean up returns values in iso_connect_ind()

[ Upstream commit 18d88f0fd8c0fade7ae08c2778d6c6447b11f16a ]

This function either returns 0 or HCI_LM_ACCEPT.  Make it clearer which
returns are which and delete the "lm" variable because it is no longer
required.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Stable-dep-of: a5b862c6a221 ("Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()")
Signed-off-by: Sasha Levin <sashal@kernel.org>