W32 version tries to write to /dev/null

[Andrew Berg]

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I used the -n switch to simulate signing and it returned an error
saying that /dev/null doesn't exist.
gpg -v -n -o "somefile" -s "someotherfile"
returns
gpg: can't create `/dev/null': No such file or directory
gpg: signing failed: file create error

GPG 1.4.7 (W32)

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