All callers of mtdtest_read() print the same error message on failure.
This incorporates the error message to mtdtest_read() and removes them
from the callers.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>