hfsplus: rework processing of hfs_btree_write() returned error

hfsplus: rework processing of hfs_btree_write() returned error

Add to hfs_btree_write() a return of -EIO on failure of b-tree node
searching.  Also add logic ofor processing errors from hfs_btree_write()
in hfsplus_system_write_inode() with a message about b-tree writing
failure.

[[email protected]: reduce scope of `err', print errno on error]
Signed-off-by: Vyacheslav Dubeyko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Al Viro <[email protected]>
Acked-by: Hin-Tak Leung <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>