xen/spinlock: Fix check from greater than to be also be greater or equal to.
During review of git commit cb9c6f15 ("xen/spinlock: Check against default value of -1 for IRQ line.") Stefano pointed out a bug in the patch. Unfortunatly due to vacation timing the fix was not applied and this patch fixes it up. Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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