xen/time: Add default value of -1 for IRQ and check for that.
If the timer interrupt has been de-init or is just now being
initialized, the default value of -1 should be preset as
interrupt line. Check for that and if something is odd
WARN us.
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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