Loader: Fix BusFault in handling of OOM

[Willy-JL]

What's new

• during OOM propagation, ELF file has small chance of trying to free relocation data that is not allocated:
• elf_load_section_data() does not allocate fast_rel->data if not enough ram
• but elf_preload_section() allocated fast_rel itself, so both would try to be freed when only 1 exists
• in particular, this was observable in upython app

Verification

• try to run upython app
• either it opens, or it gives out of memory message, not crash

Checklist (For Reviewer)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[Willy-JL]

there is something else to consider... basically this was doing aligned_free(NULL)... maybe this situation should be checked? then rather than BusFault you will get something like free(0) message, similar to malloc(0)