scsi: mpt3sas: Fix loop logic

The retry loop continues to iterate until the count reaches 30, even after
receiving the correct value. Exit loop when a non-zero value is read.

Fixes: 4ca10f3e ("scsi: mpt3sas: Perform additional retries if doorbell read returns 0")
Cc: stable@vger.kernel.org
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20231020105849.6350-1-ranjan.kumar@broadcom.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpt3sas/mpt3sas_base.c

@@ -223,8 +223,8 @@ _base_readl_ext_retry(const void __iomem *addr)
 
 	for (i = 0 ; i < 30 ; i++) {
 		ret_val = readl(addr);
-		if (ret_val == 0)
-			continue;
+		if (ret_val != 0)
+			break;
 	}
 
 	return ret_val;