消除unreadVariable：移除3处冗余变量初始化

App/time_sync.c

@@ -36,7 +36,7 @@
 static int time_sync_open_listener(void)
 {
     int retry;
-    int s = -1;
+    int s;
 
     for (retry = 0; retry < 5; retry++) {
         s = net_socket(NET_AF_INET, NET_SOCK_STREAM);

App/util/ringbuf.c

@@ -91,7 +91,7 @@ size_t ringbuf_peek(const ringbuf_t *rb, uint8_t *data, size_t len)
 {
     size_t n = 0;
     size_t i = 0;
-    size_t idx = 0;
+    size_t idx;
 
     n = ringbuf_avail(rb);
     n = (n < len) ? n : len;

Drivers/BSP/GD5F2GQ5UE/gd5f2gq5ue.c

@@ -585,7 +585,7 @@ int gd5f2gq5ue_read_id(uint8_t *p_mid, uint8_t *p_did) {
  * 函数说明：自动处理跨页读取；offset+size 越界返回错误
  */
 int gd5f2gq5ue_read(long offset, uint8_t *p_buf, size_t size) {
-    int ret = GD5F_OK;
+    int ret;
 
     if (offset < 0 || (uint32_t)offset + (uint32_t)size > GD5F_TOTAL_SIZE) {
         return GD5F_ERROR;
@@ -628,7 +628,7 @@ int gd5f2gq5ue_read(long offset, uint8_t *p_buf, size_t size) {
  * 函数说明：自动处理跨页写入；offset+size 越界返回错误
  */
 int gd5f2gq5ue_write(long offset, const uint8_t *p_buf, size_t size) {
-    int ret = GD5F_OK;
+    int ret;
 
     if (offset < 0 || (uint32_t)offset + (uint32_t)size > GD5F_TOTAL_SIZE) {
         return GD5F_ERROR;
@@ -665,7 +665,7 @@ int gd5f2gq5ue_write(long offset, const uint8_t *p_buf, size_t size) {
  * 函数说明：循环擦除 [offset, offset+size) 覆盖的每个块，偏移/长度不对齐返回错误
  */
 int gd5f2gq5ue_erase(long offset, size_t size) {
-    int ret = GD5F_OK;
+    int ret;
 
     if (offset % GD5F_BLOCK_SIZE != 0) {
         return GD5F_ERROR;