Attest: Improve code quality

This patch fixes the following things:
* avoid implicit casting by using matching types or casting
* be explicit about return values of functions not checked
* fix indentation of code
* remove whitespaces

Change-Id: I8264b177d483d9f9f5f9e43e83f2268d0182d396
Signed-off-by: Hugues de Valon <hugues.devalon@arm.com>
4 files changed