Two more small fixes

 - The conversion of enums into their actual numbers to display
   in the event format file had an off-by-one bug, that could cause
   an enum not to be converted, and break user space parsing tools.

 - A fix to a previous fix to bring back the context recursion checks.
   The interrupt case checks for NMI, IRQ and softirq, but the softirq
   returned the same number regardless if it was set or not, although
   the logic would force it to be set if it were hit.
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