Merge branch 'bugfix/fix_dvp_recv_trans_buf_error' into 'master'

fix(esp_driver_cam): Fix DVP get trans buffer error

Closes IDF-13461

See merge request espressif/esp-idf!40087

Author: Icarus113

components/esp_driver_cam/dvp/src/esp_cam_ctlr_dvp_cam.c

@@ -150,7 +150,7 @@ static esp_err_t esp_cam_ctlr_dvp_config_input_gpio(int pin, int signal, bool in
 static IRAM_ATTR esp_err_t esp_cam_ctlr_dvp_start_trans(esp_cam_ctlr_dvp_cam_t *ctlr)
 {
     bool buffer_ready = false;
-    esp_cam_ctlr_trans_t trans;
+    esp_cam_ctlr_trans_t trans = {0};
 
     if (ctlr->cur_buf) {
         ctlr->cur_buf = NULL;
@@ -163,7 +163,9 @@ static IRAM_ATTR esp_err_t esp_cam_ctlr_dvp_start_trans(esp_cam_ctlr_dvp_cam_t *
         if (trans.buffer) {
             buffer_ready = true;
         }
-    } else if (!ctlr->bk_buffer_dis) {
+    }
+
+    if (!buffer_ready && !ctlr->bk_buffer_dis) {
         trans.buffer = ctlr->backup_buffer;
         trans.buflen = ctlr->fb_size_in_bytes;
         buffer_ready = true;