bnxt_en: Fix a possible memory leak in bnxt_ptp_init

In bnxt_ptp_init(), when ptp_clock_register() fails, the driver is
not freeing the memory allocated for ptp_info->pin_config.  Fix it
to unconditionally free ptp_info->pin_config in bnxt_ptp_free().

Fixes: caf3eed ("bnxt_en: 1PPS support for 5750X family chips")
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20251104005700.542174-3-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Kalesh AP

drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c

@@ -1051,9 +1051,9 @@ static void bnxt_ptp_free(struct bnxt *bp)
 	if (ptp->ptp_clock) {
 		ptp_clock_unregister(ptp->ptp_clock);
 		ptp->ptp_clock = NULL;
-		kfree(ptp->ptp_info.pin_config);
-		ptp->ptp_info.pin_config = NULL;
 	}
+	kfree(ptp->ptp_info.pin_config);
+	ptp->ptp_info.pin_config = NULL;
 }
 
 int bnxt_ptp_init(struct bnxt *bp)