nmbd.c open_sockets() have wonder initialization.

[David Collier-Brown]

Kenichi Okuyama wrote:
> 2) Now, file descriptor with invalid value is -1.
>   So, we know that any number < 0 is invalid file descriptor.
>   BUT! who knows. Someone might wish to add new value less than
>   0 for some other meaning.

	In fact, that's happened in some unix-like software:
	my leaky memory also says that winsock fd's are negative.

--dave
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