kernel32: Reject a format string with insertions if no variadic arguments are passed to FormatMessageA/W.

[Andrew Nguyen]

---
 dlls/kernel32/format_msg.c       |    7 ++++
 dlls/kernel32/tests/format_msg.c |   64 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 0 deletions(-)


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