Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3719

This issue is introduced by the commit 43d7e607.
Token->RspData.H2AData is de-allocated on error but it is not
set to NULL. HTTP module attempts to free again and cause assert.

Signed-off-by: Baraneedharan Anbazhagan <[email protected]>
Reviewed-by: Wu Jiaxin <[email protected]>