folly/IndexedMemPool: correct an erroneous test for failed mmap
Summary: * folly/IndexedMemPool.h (IndexedMemPool): Correct the test for failed mmap. Upon failure, it returns MAP_FAILED, not nullptr. Test Plan: fbconfig -r folly/test:indexed_mem_pool_test && fbmake runtests Reviewed By: ngbronson@fb.com FB internal diff: D1480389 Tasks: 4846893 @override-unit-failures
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