scripts/fuzz.sh: fix multiple issues with "stub" overlays

Fixes commit deed9a8 ("scripts: fuzz: add support for build and
overlays")

The main issue was the way fuzz.sh was trying to parse the overlay
file. Drop that and just pass it as is to `west` and `cmake` instead,
they know what to do with it.

Also:

- Fix invalid syntax in stub_build_all_ipc4.conf
- Make fuzz.sh shellcheck-clean again. Always use shellcheck.
- Temporarily disable `CONFIG_COMP_SMART_AMP` in
  stub_build_all_ipc3.conf because `smart_amp.c` does not compile (in
  any configuration)

```
sof/src/audio/smart_amp/smart_amp.c:748:9: error:
   no member named 'in_channels' in 'struct smart_amp_data'
   sad->in_channels = audio_stream_get_channels(&source_buffer->stream);
```

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

.github/workflows/build_all.yml

@@ -61,4 +61,4 @@ jobs:
  cd workspace
  clang --verbose
  set -x
- sof/scripts/fuzz.sh -b -c stub_build_all_${{ matrix.IPC }}.conf -- "$cmake_arg"
+ sof/scripts/fuzz.sh -b -- -DOVERLAY_CONFIG=stub_build_all_${{ matrix.IPC }}.conf

app/stub_build_all_ipc3.conf

@@ -4,11 +4,14 @@ CONFIG_COMP_TONE=n
 CONFIG_COMP_CROSSOVER=y
 CONFIG_COMP_DRC=y
 CONFIG_COMP_MULTIBAND_DRC=y
-CONFIG_COMP_SMART_AMP=y
 CONFIG_PASSTHROUGH_CODEC=y
 CONFIG_WAVES_CODEC=y
 CONFIG_DTS_CODEC=y
 CONFIG_COMP_IGO_NR=y
 CONFIG_COMP_RTNR=y
-CONFIG_COMP_SMART_AMP=y
+# temporarily disabled until it compiles:
+# sof/src/audio/smart_amp/smart_amp.c:748:9: error:
+# no member named 'in_channels' in 'struct smart_amp_data'
+# sad->in_channels = audio_stream_get_channels(&source_buffer->stream);
+CONFIG_COMP_SMART_AMP=n
 CONFIG_MAXIM_DSM=y

app/stub_build_all_ipc4.conf

@@ -1,5 +1,5 @@
--DCONFIG_COMP_STUBS=y
--DCONFIG_COMP_ARIA=y
--DCONFIG_COMP_CHAIN_DMA=y
--DCONFIG_COMP_UP_DOWN_MIXER=y
--DCONFIG_IPC_MAJOR_4=y
+CONFIG_COMP_STUBS=y
+CONFIG_COMP_ARIA=y
+CONFIG_COMP_CHAIN_DMA=y
+CONFIG_COMP_UP_DOWN_MIXER=y
+CONFIG_IPC_MAJOR_4=y

scripts/fuzz.sh

@@ -49,14 +49,14 @@ main()
 {
  setup
 
+ BUILD_ONLY=false
  # Parse "$@". getopts stops after '--'
- while getopts "ho:t:c:b" opt; do
+ while getopts "ho:t:b" opt; do
  case "$opt" in
  h) print_help; exit 0;;
  o) FUZZER_STDOUT="$OPTARG";;
  t) TEST_DURATION="$OPTARG";;
- b) BUILD_ONLY=1;;
- c) OVERLAY="$OPTARG";;
+ b) BUILD_ONLY=true;;
  *) print_help; exit 1;;
  esac
  done
@@ -80,15 +80,11 @@ main()
  -DCONFIG_ASAN=y
  )
 
- if [ ! -z $OVERLAY ]; then
- overlay_config=$(xargs -a "$SOF_TOP/app/$OVERLAY" printf -- "-D%s ")
- fi
-
  west build -d build-fuzz -b native_posix "$SOF_TOP"/app/ -- \
- "${fuzz_configs[@]}" "$overlay_config" "$@"
+ "${fuzz_configs[@]}" "$@"
 
- if [ $BUILD_ONLY -eq 1 ]; then
- exit
+ if $BUILD_ONLY; then
+ exit 0
  fi
 
  mkdir -p ./fuzz_corpus