添加对>=5.0.2内核支持，修复编译报错

dfs_lfs.c

@@ -9,6 +9,14 @@
 #include <stdio.h>
 #include <string.h>
 
+#if defined(RT_VERSION_CHECK) && (RTTHREAD_VERSION >= RT_VERSION_CHECK(5, 0, 2))
+#define DFS_LFS_RETURN_TYPE ssize_t
+#define DFS_LFS_MKFS(dev_id, fs_name) _dfs_lfs_mkfs(dev_id, fs_name)
+#else
+#define DFS_LFS_RETURN_TYPE int
+#define DFS_LFS_MKFS(dev_id, fs_name) _dfs_lfs_mkfs(dev_id)
+#endif
+
 #ifndef RT_DEF_LFS_DRIVERS
     #define RT_DEF_LFS_DRIVERS 1
 #endif
@@ -362,7 +370,7 @@ static int _dfs_lfs_unmount(struct dfs_filesystem* dfs)
 }
 
 #ifndef LFS_READONLY
-static int _dfs_lfs_mkfs(rt_device_t dev_id)
+static int DFS_LFS_MKFS(rt_device_t dev_id, const char *fs_name)
 {
     int result;
     int index;
@@ -713,7 +721,7 @@ static int _dfs_lfs_ioctl(struct dfs_file* file, int cmd, void* args)
     return -ENOSYS;
 }
 
-static int _dfs_lfs_read(struct dfs_file* file, void* buf, size_t len)
+static DFS_LFS_RETURN_TYPE _dfs_lfs_read(struct dfs_file* file, void* buf, size_t len)
 {
     lfs_ssize_t ssize;
     dfs_lfs_fd_t* dfs_lfs_fd;
@@ -752,7 +760,7 @@ static int _dfs_lfs_read(struct dfs_file* file, void* buf, size_t len)
 }
 
 #ifndef LFS_READONLY
-static int _dfs_lfs_write(struct dfs_file* file, const void* buf, size_t len)
+static DFS_LFS_RETURN_TYPE _dfs_lfs_write(struct dfs_file* file, const void* buf, size_t len)
 {
     lfs_ssize_t ssize;
     dfs_lfs_fd_t* dfs_lfs_fd;
@@ -812,7 +820,7 @@ static int _dfs_lfs_flush(struct dfs_file* file)
     return _lfs_result_to_dfs(result);
 }
 
-static int _dfs_lfs_lseek(struct dfs_file* file, rt_off_t offset)
+static DFS_LFS_RETURN_TYPE _dfs_lfs_lseek(struct dfs_file* file, rt_off_t offset)
 {
     dfs_lfs_fd_t* dfs_lfs_fd;