Chrome Frame: Fix bogus null check found by PVS Studio.

chrome_frame/chrome_frame_npapi.cc

Index: chrome_frame/chrome_frame_npapi.cc
diff --git a/chrome_frame/chrome_frame_npapi.cc b/chrome_frame/chrome_frame_npapi.cc
index 84e2bc70a21cb1bafbef262a9f44db6ea9b8f17f..0baab275d1d6c0582e768025804bfc81f95c92fc 100644
--- a/chrome_frame/chrome_frame_npapi.cc
+++ b/chrome_frame/chrome_frame_npapi.cc
@@ -399,7 +399,7 @@ bool ChromeFrameNPAPI::Invoke(NPObject* header, NPIdentifier name,
                               const NPVariant* args, uint32_t arg_count,
                               NPVariant* result) {
   ChromeFrameNPAPI* plugin_instance = ChromeFrameInstanceFromNPObject(header);
-  if (!plugin_instance && (plugin_instance->automation_client_.get()))
+  if (!plugin_instance || !plugin_instance->automation_client_.get())
     return false;
 
   bool success = false;