Fix a syntax error

(cherry picked from commit 320b29e)

Author: adrian-prantl

lldb/test/API/functionalities/signal/TestSendSignal.py

@@ -104,4 +104,4 @@ def match_state(self, process_listener, expected_state):
         state = lldb.SBProcess.GetStateFromEvent(event)
         self.assertEquals(state, expected_state,
                         "It was the %s state." %
-                        lldb.SBDebugger_StateAsCString(expected_state))
+                        lldb.SBDebugger.StateAsCString(expected_state))