scsi: mpt3sas: Remove unnecessary parentheses and simplify null checks

Clang warns when multiple pairs of parentheses are used for a single conditional statement.

drivers/scsi/mpt3sas/mpt3sas_base.c:535:11: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]

        if ((ioc == NULL))
             ~~~~^~~~~~~

drivers/scsi/mpt3sas/mpt3sas_base.c:535:11: note: remove extraneous parentheses around the comparison to silence this warning
if ((ioc == NULL))
~ ^ ~
drivers/scsi/mpt3sas/mpt3sas_base.c:535:11: note: use '=' to turn this equality comparison into an assignment

        if ((ioc == NULL))
                 ^~
                 =
drivers/scsi/mpt3sas/mpt3sas_base.c:539:12: warning: equality comparison
with extraneous parentheses [-Wparentheses-equality]
        if ((pdev == NULL))
             ~~~~~^~~~~~~

drivers/scsi/mpt3sas/mpt3sas_base.c:539:12: note: remove extraneous parentheses around the comparison to silence this warning
if ((pdev == NULL))
~ ^ ~
drivers/scsi/mpt3sas/mpt3sas_base.c:539:12: note: use '=' to turn this equality comparison into an assignment

        if ((pdev == NULL))
                  ^~
                  =

2 warnings generated.

Remove them and while we're at it, simplify the NULL checks as '!var' is used more than 'var == NULL'.

---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 59d7844ee022..a49f16fed4c8 100644
@@ -532,11 +532,11 @@ static int mpt3sas_remove_dead_ioc_func(void *arg)
 	struct MPT3SAS_ADAPTER *ioc = (struct MPT3SAS_ADAPTER *)arg;
 	struct pci_dev *pdev;
 
-	if ((ioc == NULL))
+	if (!ioc)
 		return -1;
 
 	pdev = ioc->pdev;
-	if ((pdev == NULL))
+	if (!pdev)
 		return -1;
 	pci_stop_and_remove_bus_device_locked(pdev);
 	return 0;

2.19.0