alsa: remove crash on init

If alsactl init does not recognise the device,
it will return error code 99 and bring down the whole test.
We do not care for unrecognised devices and will ignore it instead.

Signed-off-by: Lukasz Mrugala <lukaszx.mrugala@intel.com>

Author: LukaszMrugala

case-lib/lib.sh

@@ -1255,7 +1255,16 @@ set_alsa_settings()
 {
     # This will bring the machine ALSA state to a common known point - a good baseline
     dlogi "Initialising ALSA configuration for $PNAME with alsactl"
+
+    # If alsactl init does not recognise the device, it will return error code 99 and bring down the whole test.
+    # We do not care for unrecognised devices and will ignore it instead.
+    E_FLAG=0
+    [[ "$-" == *e* ]] || E_FLAG=$?
+    set +e
     alsactl init
+    if [ "$E_FLAG" -eq 0 ] then
+        set -e
+    fi
 
     # ZEPHYR platform shares same tplg, remove '_ZEPHYR' from platform name
     local PNAME="${1%_ZEPHYR}"