Add an error message and don't add child process for invalid ident

renderdoc/core/core.cpp

@@ -1726,6 +1726,13 @@ void RenderDoc::FinishCaptureWriting(RDCFile *rdc, uint32_t frameNumber)
 
 void RenderDoc::AddChildProcess(uint32_t pid, uint32_t ident)
 {
+  if(ident == 0 || ident == m_RemoteIdent)
+  {
+    RDCERR("Child process %u returned invalid ident %u. Possibly too many listen sockets in use!",
+           pid, ident);
+    return;
+  }
+
   SCOPED_LOCK(m_ChildLock);
   m_Children.push_back(make_rdcpair(pid, ident));
 }