am aaf3f56c: block is bad if ioctl() returns nonzero

Merge commit 'aaf3f56c44c37dca4ef9cc9efde68727ca26105f' into gingerbread-plus-aosp

* commit 'aaf3f56c44c37dca4ef9cc9efde68727ca26105f':
  block is bad if ioctl() returns nonzero