re PR libstdc++/8645 (unnecessary non-0 checks in stl_tree.h)

2002-11-22  Laszlo Ersek  <erseklaszlo@chello.hu>
	    Paolo Carlini  <pcarlini@unitus.it>

	PR libstdc++/8645
	* include/bits/stl_tree.h (_Rb_tree_rebalance_for_erase):
	Don't check that __w->_M_left != 0 and __w->_M_right != 0
	when they can't be otherwise.

Co-Authored-By: Paolo Carlini <pcarlini@unitus.it>

From-SVN: r59381

libstdc++-v3/ChangeLog

+2002-11-22  Laszlo Ersek  <erseklaszlo@chello.hu>
+            Paolo Carlini  <pcarlini@unitus.it>
+
+	PR libstdc++/8645
+	* include/bits/stl_tree.h (_Rb_tree_rebalance_for_erase):
+	Don't check that __w->_M_left != 0 and __w->_M_right != 0
+	when they can't be otherwise.
+
 2002-11-21  Phil Edwards  <pme@gcc.gnu.org>
 
 	* docs/html/documentation.html:  Fix broken/thinko'd URL.

libstdc++-v3/include/bits/stl_tree.h

@@ -457,7 +457,7 @@ namespace std
 		  if (__w->_M_right == 0 
 		      || __w->_M_right->_M_color == _M_black) 
 		    {
-		      if (__w->_M_left) __w->_M_left->_M_color = _M_black;
+		      __w->_M_left->_M_color = _M_black;
 		      __w->_M_color = _M_red;
 		      _Rb_tree_rotate_right(__w, __root);
 		      __w = __x_parent->_M_right;
@@ -494,7 +494,7 @@ namespace std
 		{
 		  if (__w->_M_left == 0 || __w->_M_left->_M_color == _M_black) 
 		    {
-		      if (__w->_M_right) __w->_M_right->_M_color = _M_black;
+		      __w->_M_right->_M_color = _M_black;
 		      __w->_M_color = _M_red;
 		      _Rb_tree_rotate_left(__w, __root);
 		      __w = __x_parent->_M_left;