staging: exfat: Correct return code

Use -ENOTEMPTY rather than -EEXIST for attempting to remove
a directory that still has files in it.
Signed-off-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Link: https://lore.kernel.org/r/20191112021000.42091-10-Valdis.Kletnieks@vt.eduSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/exfat/exfat_super.c

@@ -2167,7 +2167,7 @@ static int ffsRemoveDir(struct inode *inode, struct file_id_t *fid)
 	clu_to_free.flags = fid->flags;
 
 	if (!is_dir_empty(sb, &clu_to_free)) {
-		ret = -EEXIST;
+		ret = -ENOTEMPTY;
 		goto out;
 	}