ext4: remove unnecessary 'offset' assignment

Although it is in the loop, offset is reassigned at the beginning of the
while loop.  And after the loop, the value will not be used

The clang_analyzer complains as follows:

fs/ext4/dir.c:306:3 warning:

Value stored to 'offset' is never read

Reported-by: Zeal Robot <[email protected]>
Signed-off-by: luo penghao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>

Author: luo penghao

fs/ext4/dir.c

@@ -303,7 +303,6 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
 			goto done;
 		brelse(bh);
 		bh = NULL;
-		offset = 0;
 	}
 done:
 	err = 0;