kernel32: Fix calculation of returned buffer in get_registry_locale_info.

[Sebastian Lackner]

Fixes a regression introduced by 8826ba1bc86fefa22c543608585ae8f3b4310a5f.
We cannot decide if we have to append a terminating null char unless we have queried again with a bigger buffer.

---
 dlls/kernel32/locale.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
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