[Tizen] Fix wrongly passed variable to function in audiosystem

js_reply variable was prepared, but instead of it js_message was
passed to PostMessage function. Some other nits were fixed.

Change-Id: Id19978ecd38c516c8e16aea3749796fd9400748f
[Tizen] Prevent segmentation faults in bluetooth

Fixes are connected with cases when null pointers were not
handled properly. Some other nits fixed.

Change-Id: I4263b2643c2fbd67d8cbe9315235bbec2cb638dd
Merge pull request #428 from piotrowskim/rm_nits_bluetooth

[Tizen] Prevent segmentation faults in bluetooth
Merge pull request #427 from piotrowskim/rm_unused_audiosystem

[Tizen] Fix wrongly passed variable to function in audiosystem