IB/ehca: Fix mismatched spin_unlock in irq handler

The lock is taken with _irqsave and hence must be released with
_irqrestore on all paths.

Signed-off-by Hoang-Nam Nguyen <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/hw/ehca/ehca_irq.c

···
 					cq = idr_find(&ehca_cq_idr, token);
 
 					if (cq == NULL) {
-						spin_unlock(&ehca_cq_idr_lock);
+						spin_unlock_irqrestore(&ehca_cq_idr_lock,
+								       flags);
 						break;
 					}