suppress a couple of spurious warnings in scsi-generic.c

This patch fixes two spurious `may be used uninitialised' warnings
when compiling with some compilers.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5127 c046a42c-6fe2-441c-8c8c-71466251a162

hw/scsi-generic.c

@@ -478,8 +478,8 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
                                  uint8_t *cmd, int lun)
 {
     SCSIDeviceState *s = d->state;
-    uint32_t len;
-    int cmdlen;
+    uint32_t len=0;
+    int cmdlen=0;
     SCSIRequest *r;
     int ret;