min_not_zero()

[Matthew Wilcox <willy@debian.org>]

Here's a thought ...

#define min_not_zero(l, r) \
	min((unsigned long)(l - 1), (unsigned long)(r - 1)) + 1

Seems to me that'll always give the right answer ... 0 if both 0,
otherwise the lower of the two.  And it's kind of an awkward name.
How about making it *really* specific to request_queue, putting it in
blkdev.h and calling it request_sector_min() like so:

#define request_sector_min(a, b) \
	min((a)->max_sectors - 1, (b)->max_sectors - 1) + 1

(no cast needed cos they're already unsigned.  um, unless I've misremembered
how C constants work again... should they be 1U?)

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