examples/multi_webcamera: Fix stuck the app

Re-create server socket when accept() returned error.

When the error occurred, the application appeared to be stuck.
This situation could occur sometime. (e.g. when WiFi connection was
disassociated).

examples/multi_webcamera/multiwebcam_main.c

@@ -126,6 +126,12 @@ int main(int argc, FAR char *argv[])
           printf("Finish Jpeg thread.\n");
           wsock = 0;
         }
+      else
+        {
+          printf("Accept is failed. Re-create server socket\n");
+          rsock = multiwebcam_initserver(MULTIWEBCAM_PORT_NO);
+        }
+
       sleep(1);
     }
 

examples/multi_webcamera/multiwebcam_server.c

@@ -62,13 +62,7 @@ static int send_binary(int s, const char *data, int len)
 
       if (ret == 0)
         {
-          /* It may fail to write when the host browser is stopped due to
-           * network error. In this case, it returns an error to terminate
-           * this thread and waits for new socket reconnection.
-           */
-
-          printf("Error. Cannot send socket.\n");
-          return -1;
+          printf("Send 0 byte. Maybe poor reception..\n");
         }
 
       if (ret < 0)