qemu_driver: update comments for qemuDomainSaveInternal

s/libvirt.c/libvirt-domain.c
Signed-off-by: NChen Hanxiao <chenhanxiao@gmail.com>

src/qemu/qemu_driver.c

@@ -3177,7 +3177,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
         }
     }
 
-   /* libvirt.c already guaranteed these two flags are exclusive.  */
+   /* libvirt-domain.c already guaranteed these two flags are exclusive.  */
     if (flags & VIR_DOMAIN_SAVE_RUNNING)
         was_running = true;
     else if (flags & VIR_DOMAIN_SAVE_PAUSED)