tweaks: remove two superfluous assignments

The variable 'last_action' is set at the end of these functions,
serving to prevent a fresh action from being merged with an older
action further down on the stack.  Setting 'last_action' before
exiting from undo()/redo() makes no sense.

Also adjust a sideways related old Changelog item.

ChangeLog.2007-2015

@@ -3555,10 +3555,10 @@ GNU nano 2.1.4 - 2008.08.09
 	* text.c (add_undo): Fix check for multi-line cut check skips adding other new legit events.
 
 2008-07-23 Chris Allegretta <chrisa@asty.org>
-	* text.c: Reset openfile-> to OTHER after an undo or redo so we don't
-	  mistakenly think this is an update when it's really an add.  Also
-	  fix an extra ; after an if statement which makes nano try to free
-	  a struct which may be NULL.
+	* text.c: Reset openfile->last_action to OTHER after an undo or redo
+	  so we don't mistakenly think this is an update when it's really an
+	  add.  Also fix a mistaken ; after an if statement which made nano
+	  try to free a struct which might be NULL.
 
 GNU nano 2.1.3 - 2008.08.04
 

src/text.c

@@ -764,7 +764,6 @@ void do_undo(void)
 	case SPLIT_END:
 		goto_line_posx(u->lineno, u->begin);
 		openfile->current_undo = openfile->current_undo->next;
-		openfile->last_action = OTHER;
 		while (openfile->current_undo->type != SPLIT_BEGIN)
 			do_undo();
 		u = openfile->current_undo;
@@ -939,7 +938,6 @@ void do_redo(void)
 	case SPLIT_BEGIN:
 		goto_line_posx(u->lineno, u->begin);
 		openfile->current_undo = u;
-		openfile->last_action = OTHER;
 		while (openfile->current_undo->type != SPLIT_END)
 			do_redo();
 		u = openfile->current_undo;