qemuFDPassTransferMonitor: Close local copy of the FD as soon as it's passed to qemu

We don't want to keep the FDs open more than we need to.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_fd.c

@@ -278,6 +278,7 @@ qemuFDPassTransferMonitor(qemuFDPass *fdpass,
                 return -1;
         }
 
+        VIR_FORCE_CLOSE(fdpass->fds[i].fd);
         fdpass->passed = true;
     }