Fix for "In Progress" error while media audio conn

Fix for "In Progress" error while media audio conn

[Model] All
[BinType] AP
[Customer] All

[Issue#] PLM
[Request] P170221-05634, P170221-06954
[Occurrence Version] All

[Problem] Media audio connection request was returning "In Progress" error
[Cause & Measure] Cause: While a media audio connect returned with error,
and its req_info was already removed after HF connection. Then the device will
not be removed from connecting_list, thus returning error there after for each
connection request
                  Measure: The device must be removed from connecting_list
even if the req_info is NULL.
[Checking Method] Unit testing

[Team] Connectivity
[Developer] sreeraj.mk
[Solution company] Samsung
[Change Type] N/A

Change-Id: Ibdb62ae67e7430992980cf0f775fd78366d38bf8