Connectivity: Fix Coverity bugs

Fixes the following bugs discovered by the Coverity tool:
1. Data pointer handling was not done correctly in ste_cg29xx_audio.c
2. skb handling was not correct in ste_conn chip files

ST-Ericsson ID: ER 263882

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Change-Id: Iec59e79b035d5af544547b6848fc98ed5b38c105
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/2533
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
3 files changed