Fix false-positive used-before-assignment with := in Return node

ChangeLog

@@ -114,6 +114,10 @@ Release date: TBA
 
   Closes #3839
 
+* Fix false-positive ``used-before-assignment`` with an assignment expression in a ``Return`` node
+
+  Closes #4828
+
 
 What's New in Pylint 2.9.6?
 ===========================

pylint/checkers/variables.py

@@ -1464,6 +1464,7 @@ def _is_variable_violation(
                             astroid.AnnAssign,
                             astroid.AugAssign,
                             astroid.Expr,
+                            astroid.Return,
                         ),
                     )
                     and isinstance(defstmt.value, astroid.IfExp)

tests/functional/a/assign/assignment_expression.py

@@ -84,3 +84,8 @@ def func():
 def func2():
     return f'The number {(count := 4)} ' \
            f'is equal to {count}'
+
+
+# https://github.com/PyCQA/pylint/issues/4828
+def func3():
+    return bar if (bar := "") else ""