wic: if we can't get from ioctl, try from os.stat()
Under some conditions, ioctl FIGETBSZ can't return real value.
We can try to use fallback via os.stat() to get block size.
Source of patch:
https://github.com/intel/bmap-tools/commit/
17365f4fe9089df7ee9800a2a0ced177ec4798a4
(From OE-Core rev:
d8f7cf2d38934c248be91101236f7537d0d31ea7)
Signed-off-by: Dogukan Ergun <dogukan.ergun@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
