Crash consistency bug in 3.2-nvml

[iangneal]

redis/src/server.c

Lines 4015 to 4019 in 4e622e7

	if (server.pm_pool == NULL) {
	/* Open the existing PMEM pool file. */
	server.pm_pool = pmemobj_open(server.pm_file_path, PM_LAYOUT_NAME);
	server.pm_rootoid = POBJ_ROOT(server.pm_pool, struct redis_pmem_root);
	server.pm_reconstruct_required = true;

• If the pool is corrupted or is otherwise unopenable, pmemobj_open(...) will return NULL, causing a SEGFAULT during initialization (i.e., at POBJ_ROOT).