Fix implicit fallthrough warnings.

Test: make checkbuild
Bug: 112564944
Change-Id: I0810479d070cf797623d2da449587d77e36f9754
diff --git a/media/libaudioprocessing/tests/test_utils.h b/media/libaudioprocessing/tests/test_utils.h
index b61a929..21f5862 100644
--- a/media/libaudioprocessing/tests/test_utils.h
+++ b/media/libaudioprocessing/tests/test_utils.h
@@ -23,6 +23,7 @@
 
 #include <log/log.h>
 
+#include <android-base/macros.h>
 #include <audio_utils/sndfile.h>
 
 #ifndef ARRAY_SIZE
@@ -77,14 +78,14 @@
                 }
                 return numValues;
             }
-            // fall through
+            FALLTHROUGH_INTENDED;
         case ',':
             if (hadDigit) {
                 hadDigit = false;
                 numValues++;
                 break;
             }
-            // fall through
+            FALLTHROUGH_INTENDED;
         default:
             return -1;
         }