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In case of an error in a code pattern like
```
uint64_t val;
error = memread(vcpu, gpa, &val, 1, arg);
error = vie_update_register(vcpu, reg, val, size);
```
uninitialized stack data would be used.
Reported by: Synacktiv
Reviewed by: markj
Security: HYP-21
Sponsored by: The Alpha-Omega Project
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D46107
(cherry picked from commit
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