On several points on swupd we need to free a pointer and then set it to
NULL. This is made in some areas using the free_and_clear_pointer(). But
most places free_and_clear_pointer() is used, this is not really necessary.
On the other hand it's hard to make sure that we are really setting to NULL
every pointer that we need, so we're adding a more conservative approach on
setting every pointer to NULL after free using a wrapper.
The greatest advantage of this wrapper over free_and_clear_pointer() is that
it's not type dependent and we don't need to call it with a pointer of a pointer,
so calls look more to calls to a standard free.
Signed-off-by: Otavio Pontes <otavio.pontes@intel.com>
Adding a unit test for string functions on string.h module.
Unit tests will help us to test functions that are hard to test
with function tests. String conversions, for example would be extremely
hard to test using functional tests.
Signed-off-by: Otavio Pontes <otavio.pontes@intel.com>
William Douglas