qemu: Destroy domain on decompression binary error

https://bugzilla.redhat.com/show_bug.cgi?id=894723

Currently, if qemuProcessStart() succeeds, but it's decompression
binary that returns nonzero status, we don't kill the qemu process,
but remove it from internal domain list, leaving the qemu process
hanging around totally uncontrolled.

src/qemu/qemu_driver.c

@@ -4922,8 +4922,10 @@ qemuDomainSaveImageStartVM(virConnectPtr conn,
             VIR_FORCE_CLOSE(*fd);
         }
 
-        if (virCommandWait(cmd, NULL) < 0)
+        if (virCommandWait(cmd, NULL) < 0) {
+            qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_FAILED, 0);
             ret = -1;
+        }
     }
     VIR_FORCE_CLOSE(intermediatefd);