Bluetooth: TBS: Client: Fix sizeof('\0')

sizeof('\0') is misleading as it will return 4 instead of 1,
since it will evaluate to sizeof(0), which returns the size
of the `int` type. Modify the expression to use sizeof(char)
with a comment.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
1 file changed