bluedroid: Fix build with gcc 4.8

In gcc 4.8, the warning for unused parameters is enabled by
default - causing -Werror to break the build.

Change-Id: Ifa4dbc6a7cfec0c82486906ecf3ed6d53a550c3f
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
Merge "bluedroid: Fix build with gcc 4.8"
am 33a5e99f: Merge "bluedroid: Fix build with gcc 4.8"

* commit '33a5e99f9216f9aac3c46373139f7be3bb903f49':
  bluedroid: Fix build with gcc 4.8
am 98497a52: Add support for ff/rew

* commit '98497a520010fc996a8ce490665cac6c1439dd2d':
  Add support for ff/rew
am cb21f043: Merge "LE: Add support for the HID-over-GATT profile (1/3)" into klp-dev

* commit 'cb21f0434223a51d94eb4c6b5b62f77f9efa0a83':
  LE: Add support for the HID-over-GATT profile (1/3)
am 607e3b79: Place handling of BTA_DM_DISC_BLE_RES_EVT in BLE feature ifdef

* commit '607e3b79f1731de0d08a2c03d38ae17874bc282d':
  Place handling of BTA_DM_DISC_BLE_RES_EVT in BLE feature ifdef
am 247c68fe: Add support for AbsoluteVolume

* commit '247c68fe6eee3660cbdcf4509195fe735ae25573':
  Add support for AbsoluteVolume
am c8a9f438: Incremented buffer size to accomodate default MTU

* commit 'c8a9f438cd994a7e69aa7fa957e0b9139bfdb912':
  Incremented buffer size to accomodate default MTU
am c9165134: Merge "Hid Host: Ensure Hid module is accepting events before processing" into klp-dev

* commit 'c9165134e0eb2be2da55c32bf35c2afb3ad4b652':
  Hid Host: Ensure Hid module is accepting events before processing
am a6807894: Merge "Configure BTA DM to not force master role upon inquiry" into klp-dev

* commit 'a6807894eea9cf786e1ecc7837725c4093af26ed':
  Configure BTA DM to not force master role upon inquiry
am 1e5109b5: Use product model as default bluetooth name if not defined

* commit '1e5109b5cbf49810abd0c94c413ce07db52caaca':
  Use product model as default bluetooth name if not defined
am fa825ad1: Merge "change AVRCP profile version from 1.4 to 1.3 in SDP record." into klp-dev

* commit 'fa825ad1ad772e87e60f360c35a9b0fa20dccb4e':
  change AVRCP profile version from 1.4 to 1.3 in SDP record.
am 844682e3: Merge "Changed MAP version from 1.0 to 1.1, since this is what was actually implemented" into klp-dev

* commit '844682e302538e9ebf80c05c0dc37ea28961ff39':
  Changed MAP version from 1.0 to 1.1, since this is what was actually implemented
am b99a0663: Merge "Added lock in btu_xxx_timer api" into klp-dev

* commit 'b99a066312de58711e9cf7e133338a97571c0be6':
  Added lock in btu_xxx_timer api
am 307e8d05: Merge "a2dp media packet sent too slow, which cause packet overflow." into klp-dev

* commit '307e8d05d0fc11fd07111005c379655b89b9c217':
  a2dp media packet sent too slow, which cause packet overflow.
am 003284a0: Merge "fix wrong PBAP profile SDP record which may cause some carkit interop problem." into klp-dev

* commit '003284a0c70b60a7c959ea3bbc023e0fbda26be1':
  fix wrong PBAP profile SDP record which may cause some carkit interop problem.
am b8ceaa48: Set default a2dp sbc encoding quality to high

* commit 'b8ceaa484a09be14263d5f10d022a272f9602378':
  Set default a2dp sbc encoding quality to high
am 17b504d0: native crash while skipping songs with A2DP connected

* commit '17b504d0b0b90de00f5f0c59a3601e7b7f444730':
  native crash while skipping songs with A2DP connected
am a30d95ac: Increase default bluetooth name from 15 to 31.

* commit 'a30d95acf60f04531923e8ab06d976744697bf51':
  Increase default bluetooth name from 15 to 31.
Avoid potential buffer overrun in bd2str caused by signed char

Use uint8_t to avoid sign extension as char's may be signed.
As a further safeguard, use snprintf()

Change-Id: Icdd4dba9b270bde41547677fa2f98bf215401a23