setupapi: Fix the buffer size parameter of RegSetValueExW

[Byeongsik Jeon]

>From MSDN:
  RegSetValueEx()
  cbData: Size, in bytes, of the information pointed to by the lpData parameter.

In my test, this is good work.
---
 dlls/setupapi/install.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

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