dm: add vm_pause before vm_destroy

now VM state transition only allows VM_PAUSED to
VM_POWERED_OFF, this patch call vm_pause before vm_destroy
in some vm failure cases.

Tracked-On: #4320
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

devicemodel/core/main.c

@@ -1068,6 +1068,7 @@ dev_fail:
 mevent_fail:
 	vm_unsetup_memory(ctx);
 fail:
+	vm_pause(ctx);
 	vm_destroy(ctx);
 create_fail:
 	uninit_hugetlb();