scsi: ips: Convert strnlen() to memcpy() since result should not be NUL terminated

Fixes the following W=1 kernel build warning(s):

 In file included from arch/arm/include/asm/io.h:23,
 from drivers/scsi/ips.c:164:
 In function ‘strncpy’,
 inlined from ‘ips_send_cmd’ at drivers/scsi/ips.c:3522:6:
 include/linux/string.h:297:30: warning: ‘__builtin_strncpy’ output
 truncated before terminating nul cop ying 4 bytes from a string of the same length [-Wstringop-truncation]
 297 | #define __underlying_strncpy __builtin_strncpy
 | ^
 include/linux/string.h:307:9: note: in expansion of macro ‘__underlying_strncpy’
 307 | return __underlying_strncpy(p, q, size);
 | ^~~~~~~~~~~~~~~~~~~~
 NB: Lots of these - snipping for brevity

Link: https://lore.kernel.org/r/20200723122446.1329773-14-lee.jones@linaro.org
Cc: Adaptec OEM Raid Solutions <aacraid@microsemi.com>
Cc: ipslinux@adaptec.com
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ips.c

@@ -2239,7 +2239,7 @@ ips_get_bios_version(ips_ha_t * ha, int intr)
 	major = 0;
 	minor = 0;
 
-	strncpy(ha->bios_version, "       ?", 8);
+	memcpy(ha->bios_version, "       ?", 8);
 
 	if (ha->pcidev->device == IPS_DEVICEID_COPPERHEAD) {
 		if (IPS_USE_MEMIO(ha)) {
@@ -3515,11 +3515,11 @@ ips_send_cmd(ips_ha_t * ha, ips_scb_t * scb)
 					inquiry.Flags[1] =
 					    IPS_SCSI_INQ_WBus16 |
 					    IPS_SCSI_INQ_Sync;
-					strncpy(inquiry.VendorId, "IBM     ",
+					memcpy(inquiry.VendorId, "IBM     ",
 						8);
-					strncpy(inquiry.ProductId,
+					memcpy(inquiry.ProductId,
 						"SERVERAID       ", 16);
-					strncpy(inquiry.ProductRevisionLevel,
+					memcpy(inquiry.ProductRevisionLevel,
 						"1.00", 4);
 
 					ips_scmd_buf_write(scb->scsi_cmd,
@@ -4036,9 +4036,9 @@ ips_inquiry(ips_ha_t * ha, ips_scb_t * scb)
 	inquiry.Flags[0] = IPS_SCSI_INQ_Address16;
 	inquiry.Flags[1] =
 	    IPS_SCSI_INQ_WBus16 | IPS_SCSI_INQ_Sync | IPS_SCSI_INQ_CmdQue;
-	strncpy(inquiry.VendorId, "IBM     ", 8);
-	strncpy(inquiry.ProductId, "SERVERAID       ", 16);
-	strncpy(inquiry.ProductRevisionLevel, "1.00", 4);
+	memcpy(inquiry.VendorId, "IBM     ", 8);
+	memcpy(inquiry.ProductId, "SERVERAID       ", 16);
+	memcpy(inquiry.ProductRevisionLevel, "1.00", 4);
 
 	ips_scmd_buf_write(scb->scsi_cmd, &inquiry, sizeof (inquiry));
 
@@ -5620,10 +5620,10 @@ ips_write_driver_status(ips_ha_t * ha, int intr)
 	/* change values (as needed) */
 	ha->nvram->operating_system = IPS_OS_LINUX;
 	ha->nvram->adapter_type = ha->ad_type;
-	strncpy((char *) ha->nvram->driver_high, IPS_VERSION_HIGH, 4);
-	strncpy((char *) ha->nvram->driver_low, IPS_VERSION_LOW, 4);
-	strncpy((char *) ha->nvram->bios_high, ha->bios_version, 4);
-	strncpy((char *) ha->nvram->bios_low, ha->bios_version + 4, 4);
+	memcpy((char *) ha->nvram->driver_high, IPS_VERSION_HIGH, 4);
+	memcpy((char *) ha->nvram->driver_low, IPS_VERSION_LOW, 4);
+	memcpy((char *) ha->nvram->bios_high, ha->bios_version, 4);
+	memcpy((char *) ha->nvram->bios_low, ha->bios_version + 4, 4);
 
 	ha->nvram->versioning = 0;	/* Indicate the Driver Does Not Support Versioning */