Fix integer underflow in ESDS processing

Several arithmetic operations within parseESDescriptor could underflow, leading
to an out-of-bounds read operation. Ensure that subtractions from 'size' do not
cause it to wrap around.

CYNGNOS-446
Bug: 20139950

(cherry picked from commit 07c0f59d)

Change-Id: I377d21051e07ca654ea1f7037120429d3f71924a