esp32: Change channel state information(CSI) data type from unsigned char to singed char

components/esp32/include/esp_wifi_types.h

@@ -402,7 +402,7 @@ typedef struct {
     wifi_pkt_rx_ctrl_t rx_ctrl;/**< received packet radio metadata header of the CSI data */
     uint8_t mac[6];            /**< source MAC address of the CSI data */
     bool last_word_invalid;    /**< last four bytes of the CSI data is invalid or not */
-    uint8_t *buf;              /**< buffer of CSI data */
+    int8_t *buf;               /**< buffer of CSI data */
     uint16_t len;              /**< length of CSI data */
 } wifi_csi_info_t;