Loader: Fix BusFault in handling of OOM #3992

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Task	Status
during OOM propagation, ELF file has small chance of trying to free relocation data that is not allocated:	Incomplete
`elf_load_section_data()` does not allocate `fast_rel->data` if not enough ram	Incomplete
but `elf_preload_section()` allocated `fast_rel` itself, so both would try to be freed when only 1 exists	Incomplete
in particular, this was observable in upython app	Incomplete
try to run upython app	Incomplete
either it opens, or it gives out of memory message, not crash	Incomplete
PR has description of feature/bug or link to Confluence/Jira task	Incomplete
Description contains actions to verify feature/bugfix	Incomplete
I've built this code, uploaded it to the device and verified feature/bugfix	Incomplete