bootimg: Fix a math thinko in the block count calculation
Fixes [YOCTO #1852] ... again.
The conversion from sectors to blocks was multiplying by 2 instead
of dividing by 2. Blocks are 1024 bytes, sectors are 512 bytes. The
result was images being much larger than intended.
Reported-by: Tom Zanussi <tom.zanussi@intel.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com> CC: Joshua Lock <josh@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
