Alan Cox 761097c85e Starting in r118390, swaponsomething() began to reserve the blocks at the
beginning of a swap area for a disk label.  However, neither r118390 nor
r118544, which increased the reservation from one to two blocks, correctly
accounted for these blocks when updating the variable "swap_pager_avail".
This change corrects that error.

Reviewed by:	kib
MFC after:	5 days
2017-06-06 16:52:07 +00:00
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