Covscan report contains various memory leak defects which were marked
as important. I have spent some time analyzing them and although they
were marked as important, most of them are in error cases, so probably
nothing serious. Let's fix most of them anyway. The rest are false
positives, or too complicated to fix, or already fixed in master, or
simply I am unsure about them.
Relates: https://github.com/FreeRDP/FreeRDP/issues/6981
leaked_storage: Variable "fontBaseFile" going out of scope leaks the storage it points to.
leaked_storage: Variable "image" going out of scope leaks the storage it points to.