scsi: lpfc: Add condition to delete ndlp object after sending BLS_RJT to an ABTS

scsi: lpfc: Add condition to delete ndlp object after sending BLS_RJT to an ABTS

The "Nodelist not empty" log message and an accompanying delay may be
observed when deleting an NPIV port or unloading the lpfc driver.  This can
occur due to receipt of an ABTS for which there is no corresponding login
context or ndlp allocated.  In such cases, the driver allocates a new ndlp
object to send a BLS_RJT after which the ndlp object unintentionally
remains in the NLP_STE_UNUSED_NODE state forever.

Add a check to conditionally remove ndlp's initial reference count when
queuing a BLS response.  If the initial reference is removed, then set
the NLP_DROPPED flag to notify other code paths.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20240131185112.149731-9-justintee8345@gmail.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>