few missing fixes for 4.14-stable

Hi Greg, Sasha,

These were missing in 4.14-stable. Please apply to your queue.

80e46cf22ba0 ("btrfs: tree-checker: Enhance chunk checker to validate chunk profile") 005d67127fa9 ("btrfs: adjust return values of btrfs_inode_by_name") 6bf9e4bd6a27 ("btrfs: inode: Verify inode mode to avoid NULL pointer dereference")

The second one in only needed to make the backporting of third easier.

-- Regards Sudip