Fix the LE CoC SL4A Test failure due to length check

Fix a regression from the previous CL that checks the buffer length
before doing a memcpy. The previous check is too strict causing valid
sized buffers to be rejected. The length check is incorrect and off by the header size.

Bug: 117306992
Bug: 112321180
Test: Run the LE CoC SL4A Tests
Change-Id: I9bbcd58460a02394010f74a18e9ebdbcd546d43d