fixup: dfsv2: seq: aligned proto of lseek to manual

In manual, the prototype of lseek is

`off_t lseek(int fd, off_t offset, int whence);`

where the return type is `off_t` but not ssize_t.

Signed-off-by: Shell <smokewood@qq.com>

components/dfs/dfs_v2/include/dfs_seq_file.h

@@ -56,7 +56,7 @@ static inline void dfs_seq_setwidth(struct dfs_seq_file *seq, size_t size)
 
 int dfs_seq_open(struct dfs_file *file, const struct dfs_seq_ops *ops);
 ssize_t dfs_seq_read(struct dfs_file *file, void *buf, size_t size, off_t *pos);
-ssize_t dfs_seq_lseek(struct dfs_file *file, off_t offset, int whence);
+off_t dfs_seq_lseek(struct dfs_file *file, off_t offset, int whence);
 int dfs_seq_release(struct dfs_file *file);
 int dfs_seq_write(struct dfs_seq_file *seq, const void *data, size_t len);
 

components/dfs/dfs_v2/src/dfs_seq_file.c

@@ -256,7 +256,7 @@ Enomem:
     goto Done;
 }
 
-ssize_t dfs_seq_lseek(struct dfs_file *file, off_t offset, int whence)
+off_t dfs_seq_lseek(struct dfs_file *file, off_t offset, int whence)
 {
     struct dfs_seq_file *seq = file->data;
     off_t retval = -EINVAL;