vmdk: return ERROR when cluster sector is larger than vmdk limitation

vmdk: return ERROR when cluster sector is larger than vmdk limitation

VMDK has a hard limitation of extent size, which is due to the size of grain
table entry is 32 bits. It means it can only point to a grain located at
offset = 2^32. To avoid writing the user data beyond limitation and record a useless offset
in grain table. We should return ERROR here.

Signed-off-by: yuchenlin <[email protected]>
Message-id: 20180322133337[email protected]
Reviewed-by: Fam Zheng <[email protected]>
Signed-off-by: Max Reitz <[email protected]>