scsi: lpfc: Correct CRC32 calculation for congestion stats

lpfc_cgn_calc_crc32() is returning 32 bits, and lpfc_cgn_update_stat() was
using u16 to store the crc32 value.  Correct by redeclaring the local
variable to u32.

Link: https://lore.kernel.org/r/20220412222008.126521-15-jsmart2021@gmail.com


Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>