lguest: Reboot support

Reboot Implemented

(Prevent fd leak, fix style and fix documentation --RR)

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/core.c

@@ -235,6 +235,8 @@ int run_guest(struct lguest *lg, unsigned long __user *user)
 		lguest_arch_handle_trap(lg);
 	}
 
+	if (lg->dead == ERR_PTR(-ERESTART))
+		return -ERESTART;
 	/* The Guest is dead => "No such file or directory" */
 	return -ENOENT;
 }