mptsas: fix checks for dma mapping errors

mptsas_smp_handler() checks for dma mapping errors by comparison
returned address with zero, while pci_dma_mapping_error() should be
used.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/message/fusion/mptsas.c

@@ -2281,7 +2281,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 
 	dma_addr_out = pci_map_single(ioc->pcidev, bio_data(req->bio),
 				      blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
-	if (!dma_addr_out)
+	if (pci_dma_mapping_error(ioc->pcidev, dma_addr_out))
 		goto put_mf;
 	ioc->add_sge(psge, flagsLength, dma_addr_out);
 	psge += ioc->SGE_size;
@@ -2296,7 +2296,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 	flagsLength |= blk_rq_bytes(rsp) + 4;
 	dma_addr_in =  pci_map_single(ioc->pcidev, bio_data(rsp->bio),
 				      blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
-	if (!dma_addr_in)
+	if (pci_dma_mapping_error(ioc->pcidev, dma_addr_in))
 		goto unmap;
 	ioc->add_sge(psge, flagsLength, dma_addr_in);