Fix closed socket check, fixes 'setsockopt failed while setting timeout value, Socket operation on non-socket' (#541)

Author: rafagapa

src/pcm-sensor-server.cpp

@@ -799,7 +799,7 @@ class basic_socketbuf : public std::basic_streambuf<CharT> {
 
     void setSocket( int socketFD ) {
         socketFD_ = socketFD;
-        if( 0 != socketFD )  // avoid work with 0 socket after closure socket and set value to 0
+        if( 0 == socketFD )  // avoid work with 0 socket after closure socket and set value to 0
             return;
         // When receiving the socket descriptor, set the timeout
         const auto res = setsockopt( socketFD_, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout_, sizeof(struct timeval) );