PCI/AER: Queue one GHES event, not several uninitialized ones

ecae65e1 ("PCI/AER: Use kfifo_in_spinlocked() to insert locked
elements") replaced kfifo_put() with kfifo_in_spinlocked(), but passed the
*size* of the queue entry, where kfifo_in_spinlocked() expects the *number*
of entries to be copied.

We want to insert only one element into kfifo, not "sizeof(entry) = 16".
Without this patch, we would get 15 uninitialized elements.

Fixes: ecae65e1 ("PCI/AER: Use kfifo_in_spinlocked() to insert locked elements")
Signed-off-by: Yanjiang Jin <yanjiang.jin@hxt-semitech.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>