fix(sniffer): remove useless EOF warning logs printing (#650)

component/sniffing/sniffer.go

@@ -107,13 +107,10 @@ func (s *Sniffer) SniffTcp() (d string, err error) {
 		if s.stream {
 			go func() {
 				// Read once.
-				n, err := s.buf.ReadFromOnce(s.r)
+				_, err = s.buf.ReadFromOnce(s.r)
 				if err != nil {
 					s.dataError = err
 				}
-				if n == 0 {
-					s.dataError = io.EOF
-				}
 				close(s.dataReady)
 			}()