fs: Use in_group_or_capable() helper to simplify the code

Since in_group_or_capable has been exported, we can use
it to simplify the code when check group and capable.
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Link: https://lore.kernel.org/r/20240816063849.1989856-1-lihongbo22@huawei.comReviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/posix_acl.c

@@ -715,8 +715,8 @@ int posix_acl_update_mode(struct mnt_idmap *idmap,
 		return error;
 	if (error == 0)
 		*acl = NULL;
-	if (!vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)) &&
-	    !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
+	if (!in_group_or_capable(idmap, inode,
+				 i_gid_into_vfsgid(idmap, inode)))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;