include/buffer.h: fix operator=

Fix operator=: return "iterator&" instead of 'iterator'. Check if 'this'
equals 'other' before set anything.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

src/include/buffer.h

@@ -248,7 +248,7 @@ class buffer {
 					p(other.p),
 					p_off(other.p_off) {}
 
-      iterator operator=(const iterator& other) {
+      iterator& operator=(const iterator& other) {
 	if (this != &other) {
 	  bl = other.bl;
 	  ls = other.ls;
@@ -305,8 +305,10 @@ class buffer {
 
     list(const list& other) : _buffers(other._buffers), _len(other._len), last_p(this) { }
     list& operator= (const list& other) {
-      _buffers = other._buffers;
-      _len = other._len;
+      if (this != &other) {
+        _buffers = other._buffers;
+        _len = other._len;
+      }
       return *this;
     }