scsi: qla1280: Fix kernel oops when debug level > 2

A null dereference or oops exception will eventually occur when qla1280.c
driver is compiled with DEBUG_QLA1280 enabled and ql_debug_level > 2.  I
think its clear from the code that the intention here is sg_dma_len(s) not
length of sg_next(s) when printing the debug info.

Signed-off-by: Magnus Lindholm <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

drivers/scsi/qla1280.c

@@ -2867,7 +2867,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 			dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
 				cpu_to_le32(upper_32_bits(dma_handle)),
 				cpu_to_le32(lower_32_bits(dma_handle)),
-				cpu_to_le32(sg_dma_len(sg_next(s))));
+				cpu_to_le32(sg_dma_len(s)));
 			remseg--;
 		}
 		dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "