[spi] fix issue report #6008

rt_spi_sendrecv8()存在可能未初始化值返回的情况

components/drivers/include/drivers/spi.h

@@ -271,7 +271,7 @@ rt_inline rt_size_t rt_spi_send(struct rt_spi_device *device,
 rt_inline rt_uint8_t rt_spi_sendrecv8(struct rt_spi_device *device,
                                       rt_uint8_t            data)
 {
-    rt_uint8_t value;
+    rt_uint8_t value = 0;
 
     rt_spi_send_then_recv(device, &data, 1, &value, 1);
 
@@ -281,7 +281,7 @@ rt_inline rt_uint8_t rt_spi_sendrecv8(struct rt_spi_device *device,
 rt_inline rt_uint16_t rt_spi_sendrecv16(struct rt_spi_device *device,
                                         rt_uint16_t           data)
 {
-    rt_uint16_t value;
+    rt_uint16_t value = 0;
 
     rt_spi_send_then_recv(device, &data, 2, &value, 2);
 

components/drivers/spi/device_driver_list.txt

-spi_wifi_rw009.c/spi_wifi_rw009.h
-RW009
-http://www.rt-thread.com/
-
-enc28j60.c/enc28j60.h
-http://www.microchip.com/
-
-spi_flash_sfud: Serial Flash Universal Driver
-https://github.com/armink/SFUD
\ No newline at end of file

components/drivers/spi/spi_core.c

@@ -300,7 +300,6 @@ rt_size_t rt_spi_transfer(struct rt_spi_device *device,
     else
     {
         rt_set_errno(-RT_EIO);
-
         return 0;
     }