Fix failure to handle expression-bodied local functions

Author: sharwell

src/Features/CSharp/Portable/AssignOutParameters/AssignOutParametersAtStartCodeFixProvider.cs

@@ -25,6 +25,12 @@ protected override void TryRegisterFix(CodeFixContext context, Document document
                 return;
             }
 
+            if (location is LocalFunctionStatementSyntax { ExpressionBody: { } })
+            {
+                // This is an expression-bodied local function, which is also handled by the other code fix.
+                return;
+            }
+
             if (location is StatementSyntax statement &&
                 statement.Parent is BlockSyntax block &&
                 block.Statements[0] == statement &&