IFDHCloseChannel(): use FreeChannel()
IFDHCloseChannel(): use FreeChannel()

Move part of the code of IFDHCloseChannel() into a new function
FreeChannel().
Call the new function FreeChannel() from IFDHCloseChannel().

No code semantic change.

hiranotaka/ccid-scr331-nttcom,hiranotaka/ccid-scr331-nttcom,LudovicRousseau/CCID,hiranotaka/ccid-scr331-nttcom,hiranotaka/ccid-scr331-nttcom,LudovicRousseau/CCID,LudovicRousseau/CCID