210f0d0b2b
In #2433, I inadvertently introduced a regression which causes the use of uninitialized data. Namely, the control path I added for the safety check in `arena_prof_info_get` neglected to set `prof_info->alloc_tctx` when the check fails, resulting in `prof_info.alloc_tctx` being uninitialized [when it is read at the end of `prof_free`](https://github.com/jemalloc/jemalloc/blob/90176f8a87a0b5bdb0ac4c1a515b1d9c58dc5a82/include/jemalloc/internal/prof_inlines.h#L272).