linux-user: fix up oversealous nitpicking
Looks like linux-user code was correct, just unreadable: what it wanted to do with "-=" was really assign a negative number, not decrement. Fix up accordingly. Reported-by: NLaurent Desnogues <laurent.desnogues@gmail.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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