Change `maybe_resize_storage_cpu` `new_size` arg to unsigned (#52671)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52671
Code is written with the assumption that new_size is unsigned value,
and when function is called with negative value it silently returns a nullptr rather than raise an exception.
Fix above-mentioned logic by converting new_size to unsigned type and let cpu_allocator raise exception on negative alloc.
Unroll nested if blocks by returning early if new_size is 0
Add TestNN.test_adaptive_pooling_size_overflow to indirecty validate the fix.
Fixes https://github.com/pytorch/pytorch/issues/50960
Test Plan: Imported from OSS
Reviewed By: walterddr
Differential Revision: D26607549
Pulled By: malfet
fbshipit-source-id: e3d4f7548b098f24fa5aba42d8f4e9288ece1e2e
