Valid case:
1) If the offset is more than current fragment length, adjusts offset
from next relevant fragment and starts reading or skipping.
2) If the read or skip length is more than available data length,
then throw an error.
In case of an error, frag is 'NULL' pos is '0xffff'. Rest of the cases
are successful read and skip.
Change-Id: I88c4b85e14e5821f681966b5148ba9519b91cca4
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
ead511ddae