initialize potential uninitialized variable with the type of"char*" to
be NULL in AVB. That "hashtree_error_mode" in code is manually specified
with a known value, the cases listed cover all potential value of
"hashtree_error_mode"
explicitly do a type cast for memcpy parameters.
Change-Id: Ie5d234422a273d6dab75585bd0d8eb81583707ca
Signed-off-by: faqiang.zhu <faqiang.zhu@nxp.com>