scsi-generic: remove superfluous DPRINTF avoid to break compiling

variables lun and tag had been eliminated, break compiling
when enable debug switch. Meanwhile traces provide the same
information with this DPRINTF, so remove it.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/scsi/scsi-generic.c

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 3ebe4a6..20587b4 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -303,9 +303,6 @@
     SCSIDevice *s = r->req.dev;
     int ret;
 
-    DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
-            r->req.cmd.xfer, cmd[0]);
-
 #ifdef DEBUG_SCSI
     {
         int i;