scsi: lpfc: Fix memory leak in abnormal exit path from lpfc_eq_create

eq create is leaking mailbox memory if it encounters an error.

rework error path to free the memory.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>