travis.yml: force W=1 compilation for entire sound subsystem + soundwire

This will stop for all compilation warnings and documentation warnings.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Author: plbossart

.travis.yml

@@ -58,7 +58,8 @@ jobs:
         - export ARCH=x86_64 KCFLAGS="-Wall -Werror"
         - bash kconfig/kconfig-sof-default.sh
         - make modules_prepare
-        - make -j`getconf _NPROCESSORS_ONLN` M=sound/soc/sof W=1
+        - make -j`getconf _NPROCESSORS_ONLN` sound/ W=1
+	- make -j`getconf _NPROCESSORS_ONLN` drivers/soundwire/ W=1
         - make -j`getconf _NPROCESSORS_ONLN`
         - make -j`getconf _NPROCESSORS_ONLN` bindeb-pkg
     - name: "BUILD GCC9 SST Kernel x86_64"