[PATCH] msvcp90: Don't pass NULL as reference in runtime_error and logic_error constructors.

[Piotr Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48561
Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcp90/exception.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)