Be stricter about warnings

Test: build for several platforms
Change-Id: I8d66a74c72713f3cd7021b1924f72ea4a9e11c15
diff --git a/modules/audio/Android.bp b/modules/audio/Android.bp
index 02da2b3..69e99f9 100644
--- a/modules/audio/Android.bp
+++ b/modules/audio/Android.bp
@@ -26,7 +26,7 @@
         "liblog",
         "libcutils",
     ],
-    cflags: ["-Wno-unused-parameter"],
+    cflags: ["-Wall", "-Werror", "-Wno-unused-parameter"],
 }
 
 // The stub audio HAL module, identical to the default audio hal, but with
@@ -43,7 +43,7 @@
         "liblog",
         "libcutils",
     ],
-    cflags: ["-Wno-unused-parameter"],
+    cflags: ["-Wall", "-Werror", "-Wno-unused-parameter"],
 }
 
 // The stub audio policy HAL module that can be used as a skeleton for
@@ -56,5 +56,5 @@
         "liblog",
         "libcutils",
     ],
-    cflags: ["-Wno-unused-parameter"],
+    cflags: ["-Wall", "-Werror", "-Wno-unused-parameter"],
 }