file-restore: exit with code 1 in case streaming fails

This way the task gets marked as "failed" in PVE.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

src/bin/proxmox_file_restore/block_driver_qemu.rs

@@ -228,6 +228,7 @@ impl BlockRestoreDriver for QemuBlockDriver {
                     .await
                 {
                     eprintln!("reading file extraction stream failed - {}", err);
+                    std::process::exit(1);
                 }
             });