face detect fix (#108)

Fixes #107; heap corruption and crash happening with ESP 1.0.6 when face detection is enabled.

Author: easytarget

app_httpd.cpp

@@ -398,10 +398,6 @@ static esp_err_t capture_handler(httpd_req_t *req){
             face_id = run_face_recognition(image_matrix, net_boxes);
         }
         draw_face_boxes(image_matrix, net_boxes, face_id);
-        free(net_boxes->score);
-        free(net_boxes->box);
-        free(net_boxes->landmark);
-        free(net_boxes);
     }
 
     jpg_chunking_t jchunk = {req, 0};
@@ -513,10 +509,6 @@ static esp_err_t stream_handler(httpd_req_t *req){
                                 }
                                 fr_recognize = esp_timer_get_time();
                                 draw_face_boxes(image_matrix, net_boxes, face_id);
-                                free(net_boxes->score);
-                                free(net_boxes->box);
-                                free(net_boxes->landmark);
-                                free(net_boxes);
                             }
                             if(!fmt2jpg(image_matrix->item, fb->width*fb->height*3, fb->width, fb->height, PIXFORMAT_RGB888, 90, &_jpg_buf, &_jpg_buf_len)){
                                 Serial.println("fmt2jpg failed");