pause-release-suspend-resume: fix the shellcheck warnings

Signed-off-by: Wanzhuo.Li <wanzhuox.li@intel.com>

Author: Wanzhuo.Li

test-case/check-pause-release-suspend-resume.sh

@@ -54,7 +54,9 @@ set -e
 ##      completion.
 
 CASEDIR=$(dirname "${BASH_SOURCE[0]}")
-source $CASEDIR/../case-lib/lib.sh
+
+# shellcheck source=case-lib/lib.sh
+source "$CASEDIR"/../case-lib/lib.sh
 
 OPT_NAME['m']='mode'         OPT_DESC['m']='test mode. Example: playback; capture'
 OPT_HAS_ARG['m']=1             OPT_VAL['m']='playback'
@@ -74,7 +76,7 @@ OPT_HAS_ARG['i']=1             OPT_VAL['i']='500'
 OPT_NAME['s']='sof-logger'   OPT_DESC['s']="Open sof-logger trace the data will store at $LOG_ROOT"
 OPT_HAS_ARG['s']=0             OPT_VAL['s']=1
 
-OPT_NAME['t']='tplg'     OPT_DESC['t']='tplg file, default value is env TPLG: $TPLG'
+OPT_NAME['t']='tplg'     OPT_DESC['t']='tplg path, default is environment variable: TPLG'
 OPT_HAS_ARG['t']=1         OPT_VAL['t']="$TPLG"
 
 func_opt_parse_option "$@"
@@ -107,7 +109,7 @@ setup_kernel_check_point
 
 func_pipeline_export "$tplg" "type:$test_mode & ${OPT_VAL['S']}"
 
-for idx in $(seq 0 $(expr $PIPELINE_COUNT - 1))
+for idx in $(seq 0 $((PIPELINE_COUNT - 1)))
 do
     channel=$(func_pipeline_parse_value "$idx" channel)
     rate=$(func_pipeline_parse_value "$idx" rate)
@@ -178,8 +180,7 @@ AUDIO
     #flush the output
     echo
     if [ $ret -ne 0 ]; then
-        sof-process-kill.sh
-        [[ $? -ne 0 ]] && dlogw "Kill process catch error"
+        sof-process-kill.sh || dlogw "Kill process catch error"
         exit $ret
     fi
     sof-kernel-log-check.sh "$KERNEL_CHECKPOINT" || die "Caught error in kernel log"