[PATCH v2 0/1] MR8179: crypt32: Fix invalid access of list head.

[Yuxuan Shui (＠yshui)]

At the end of LIST_FOR_EACH_ENTRY, assuming no matches are found, `provider` will point to the list
head, not NULL, as a result we call IsEqualGUID on invalid memory.

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  v2: crypt32: Fix invalid access of list head.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8179