scsi: lpfc: Early return after marking final NLP_DROPPED flag in dev_loss_tmo

When a dev_loss_tmo event occurs, an ndlp lock is taken before checking
nlp_flag for NLP_DROPPED.  There is an attempt to restore the ndlp lock
when exiting the if statement, but the nlp_put kref could be the final
decrement causing a use-after-free memory access on a released ndlp object.

Instead of trying to reacquire the ndlp lock after checking nlp_flag, just
return after calling nlp_put.

Signed-off-by: Justin Tee <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: "Ewan D. Milne" <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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