module: make module_refcount() a signed integer.
James Bottomley points out that it will be -1 during unload. It's only used for diagnostics, so let's not hide that as it could be a clue as to what's gone wrong. Cc: Jason Wessel <jason.wessel@windriver.com> Acked-and-documention-added-by: NJames Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: NMasami Hiramatsu <maasami.hiramatsu.pt@hitachi.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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