x86/nmi: Fix nmi_handle() duration miscalculation

When nmi_check_duration() is checking the time an NMI handler took to
execute, the whole_msecs value used should be read from the @duration
argument, not from the ->max_duration, the latter being used to store
the current maximal duration.

 [ bp: Rewrite commit message. ]

Fixes: 248ed51048c4 ("x86/nmi: Remove irq_work from the long duration NMI handler")
Suggested-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Libing Zhou <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Changbin Du <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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