SecurityPkg/DxeImageVerificationLib: tighten default result (CVE-2019-14575)

SecurityPkg/DxeImageVerificationLib: tighten default result (CVE-2019-14575)

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1608

All intermediate results inside this function will be checked and
returned immediately upon any failure or error, like out-of-resource,
hash calculation error or certificate retrieval failure.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>