msi: Avoid an out of bounds access in msi_build_directory_name.
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@ -2154,7 +2154,7 @@ WCHAR *msi_build_directory_name( DWORD count, ... )
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const WCHAR *str = va_arg( va, const WCHAR * );
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if (!str) continue;
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strcatW( dir, str );
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if ( i + 1 != count && dir[strlenW( dir ) - 1] != '\\') strcatW( dir, szBackSlash );
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if ( i + 1 != count && dir[0] && dir[strlenW( dir ) - 1] != '\\') strcatW( dir, szBackSlash );
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}
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va_end( va );
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return dir;
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