PR #13385 from Eran: fix rs-fw-update wait for device to reconnect

Author: maloel

tools/fw-update/rs-fw-update.cpp

@@ -100,10 +100,10 @@ std::vector<uint8_t> read_firmware_data(bool is_set, const std::string& file_pat
 }
 
 
-void update(rs2::update_device fwu_dev, std::vector<uint8_t> fw_image)
-{  
+void update( rs2::update_device fwu_dev, std::vector< uint8_t > const & fw_image )
+{
     std::cout << std::endl << "Firmware update started. Please don't disconnect device!"<< std::endl << std::endl;
-    
+
     if (ISATTY(FILENO(stdout)))
     {
         fwu_dev.update(fw_image, [&](const float progress)
@@ -528,7 +528,8 @@ try
                     }
                 }
 
-                 update( new_fw_update_device, fw_image );
+                new_device = rs2::device();  // otherwise the wait will exit right away
+                update( new_fw_update_device, fw_image );
 
                 done = true;
                 break;