Fix LE buffer size for 0 length buffers

If the local chip reports 0 LE data buffers and 0 LE ACL data package
length, then the default ACL buffer length as returned byt the
Read_Buffer_Size command is to be used instead.

Change-Id: I953fabe426a98cc1b005d3b46c3e7f227c23a686
2 files changed