New helper - current_umask()

current->fs->umask is what most of fs_struct users are doing.
Put that into a helper function.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 43764f4..fa881bd 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -215,7 +215,7 @@
 	if (error)
 		return error;
 	if (!acl) {
-		mode &= ~current->fs->umask;
+		mode &= ~current_umask();
 		if (mode != ip->i_inode.i_mode)
 			error = munge_mode(ip, mode);
 		return error;