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/jfs/acl.c b/fs/jfs/acl.c
index a166c16..06ca1b8 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -182,7 +182,7 @@
 cleanup:
 		posix_acl_release(acl);
 	} else
-		inode->i_mode &= ~current->fs->umask;
+		inode->i_mode &= ~current_umask();
 
 	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
 			       inode->i_mode;