[PATCH v2 0/1] MR9309: reg: Make sure empty is big enough.

[Yuxuan Shui (＠yshui)]

We access data[1], so empty needs to have a size of 2.

Found by ASan.

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  v2: reg: Fix out-of-bound read when string is empty.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/9309