Use Format_isValid() and Format_isEqual() instead of direct comparison

Change-Id: Ie87607aa514976947540a77775e6425c4e56e7d9
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index f9cc17b..039a0d8 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1783,7 +1783,7 @@
                                         popcount(inStream->common.get_channels(&inStream->common)));
         if (!mTeeSinkInputEnabled) {
             kind = TEE_SINK_NO;
-        } else if (format == Format_Invalid) {
+        } else if (!Format_isValid(format)) {
             kind = TEE_SINK_NO;
         } else if (mRecordTeeSink == 0) {
             kind = TEE_SINK_NEW;