hfsplus: avoid crash on failed block map free

hfsplus: avoid crash on failed block map free

If the read fails we kmap an error code.  This doesn't end well.  Instead
print a critical error and pray.  This mirrors the rest of the fs
behaviour with critical error cases.

Acked-by: Vyacheslav Dubeyko <[email protected]>
Signed-off-by: Alan Cox <[email protected]>
Signed-off-by: Vyacheslav Dubeyko <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Jan Kara <[email protected]>
Acked-by: Hin-Tak Leung <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>