Fix S5944 FP: AddressOf(MethodName) in Return statement

[martin-strecker-sonarsource]

First reported here https://community.sonarsource.com/t/119507

The use of AddressOf TestFunc in a return statement is not an assignment to the implicit return value variable TestFunc:

Public Function TestFunc() As String
    If (InvokeRequired) Then
        Return Invoke(AddressOf TestFunc) ' Noncompliant FP
    Else
        Return String.Empty
    End If
End Function