usbaudio: Add missing 'return' on error

Code in adev_open_input_stream was deallocating
a structure but then using it again due to absence
of a 'return' statement.
Found by clang-tidy.

Bug: 152526318
Test: m
Change-Id: I9ec3148197715fb118e99503d2b52412a4fb2a73
1 file changed