Fix VTS Fuzz issue
[Description] Fix is designed to fix VTS Fuzz issue, 1. Add null pointer check in bluetooth_hci.cc and vendor_interface.cc 2. send should return if open is not done; 3. add lock in callback and set new callback Bug: 247053367 Test: 1. Build Pass 2. Test VTS fuzz pass Change-Id: I78da5aeb82f9f78b2b4a156196199183ce0dd8f2
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