fix: `JEAllocator` should properly handle nullptr returned

[dantengsky]

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Summary

In JEAllocator::grow_zeroed/shrink, when je rallocx returns NULL, stop proceeding, returns AllocError error directly.

Tests

• [ ] Unit Test
• [ ] Logic Test
• [ ] Benchmark Test
• [x] No Test

Type of change

• [x] Bug Fix (non-breaking change which fixes an issue)
• [ ] New Feature (non-breaking change which adds functionality)
• [ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• [ ] Documentation Update
• [ ] Refactoring
• [ ] Performance Improvement
• [ ] Other (please describe):

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This change is