[vte] libc: glue: Make FD self-assignment safe

[Christian Persch <chpe src gnome org>]

commit 197954648bf6868e63872d9d32339bd985d4a9ef
Author: Christian Persch <chpe src gnome org>
Date:   Wed May 27 21:17:04 2020 +0200

    libc: glue: Make FD self-assignment safe

 src/libc-glue.hh | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/libc-glue.hh b/src/libc-glue.hh
index e42ebe16..941375c1 100644
--- a/src/libc-glue.hh
+++ b/src/libc-glue.hh
@@ -19,6 +19,7 @@
 
 #include <cassert>
 #include <cerrno>
+#include <memory>
 
 #include <unistd.h>
 #include <fcntl.h>
@@ -64,8 +65,10 @@ public:
 
         FD& operator=(FD&& rhs) noexcept
         {
-                reset();
-                m_fd = rhs.release();
+                if (this != std::addressof(rhs)) {
+                        reset();
+                        m_fd = rhs.release();
+                }
                 return *this;
         }