[PATCH] ntdll: Fix memchr implementation.

[Piotr Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50228
Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcrt/string.c      |  2 +-
  dlls/ntdll/string.c       |  2 +-
  dlls/ntdll/tests/string.c | 21 +++++++++++++++++++++
  3 files changed, 23 insertions(+), 2 deletions(-)