Bluetooth: ISO: Fix issue with ++ in calls to sys_le16_to_cpu
Bluetooth: ISO: Fix issue with ++ in calls to sys_le16_to_cpu

sys_le16_to_cpu is a macro, and not big endian the value
is referenced twice, which would incorrectly increment the
value.

Modifed to extract the value to a variable before calling
sys_le16_to_cpu.

Signed-off-by: Emil Gydesen <a20314356615223738233ab4c4eb1cd8cd4146fa@nordicsemi.no>

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