Fix potential NULL pointer dereference #9872
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`shm_get()` (not to be confused with `shmget()`) returns `NULL` if reallocation fails; we need to cater to that when calling the function.
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shm_get()(not to be confused withshmget()) returnsNULLif reallocation fails; we need to cater to that when calling the function.Not sure if there will be another regular bug fix release for PHP 8.0, but even if not, it might be worthwhile to merge this patch nonetheless.