Use -Werror in hardware/interfaces

* Remove unused local variables.

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I48dbbf670cc9eeff2391983788983420f8547cc9
diff --git a/drm/1.0/vts/functional/Android.bp b/drm/1.0/vts/functional/Android.bp
index b45ce84..18aebee 100644
--- a/drm/1.0/vts/functional/Android.bp
+++ b/drm/1.0/vts/functional/Android.bp
@@ -16,6 +16,7 @@
 
 cc_test {
     name: "VtsHalDrmV1_0TargetTest",
+    defaults: ["VtsHalTargetTestDefaults"],
     srcs: [
         "drm_hal_clearkey_test.cpp",
         "drm_hal_vendor_test.cpp",
diff --git a/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp b/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
index 04f2658..194b2a7 100644
--- a/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
+++ b/drm/1.0/vts/functional/drm_hal_clearkey_test.cpp
@@ -1064,8 +1064,6 @@
     AES_set_encrypt_key(&key[0], 128, &decryptionKey);
 
     size_t offset = 0;
-    size_t num = 0;
-    size_t ecount_buf = 0;
     for (size_t i = 0; i < subSamples.size(); i++) {
         memcpy(dest + offset, src + offset, subSamples[i].numBytesOfClearData);
         offset += subSamples[i].numBytesOfClearData;
@@ -1106,7 +1104,6 @@
     Status status = cryptoPlugin->setMediaDrmSession(sessionId);
     EXPECT_EQ(Status::OK, status);
 
-    const bool kNotSecure = false;
     uint32_t byteCount = decrypt(Mode::UNENCRYPTED, &iv[0], subSamples,
             noPattern, Status::OK);
     EXPECT_EQ(kByteCount, byteCount);
@@ -1133,7 +1130,6 @@
     Status status = cryptoPlugin->setMediaDrmSession(sessionId);
     EXPECT_EQ(Status::OK, status);
 
-    const bool kNotSecure = false;
     uint32_t byteCount = decrypt(Mode::AES_CTR, &iv[0], subSamples,
             noPattern, Status::OK);
     EXPECT_EQ(kClearBytes + kEncryptedBytes, byteCount);
@@ -1154,7 +1150,6 @@
     Status status = cryptoPlugin->setMediaDrmSession(sessionId);
     EXPECT_EQ(Status::OK, status);
 
-    const bool kNotSecure = false;
     uint32_t byteCount = decrypt(Mode::AES_CTR, &iv[0], subSamples,
             noPattern, Status::ERROR_DRM_NO_LICENSE);
     EXPECT_EQ(0u, byteCount);
diff --git a/drm/1.0/vts/functional/drm_hal_vendor_test.cpp b/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
index 33fb6fb..389ffec 100644
--- a/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
+++ b/drm/1.0/vts/functional/drm_hal_vendor_test.cpp
@@ -1407,8 +1407,6 @@
     AES_set_encrypt_key(&key[0], 128, &decryptionKey);
 
     size_t offset = 0;
-    size_t num = 0;
-    size_t ecount_buf = 0;
     for (size_t i = 0; i < subSamples.size(); i++) {
         const SubSample& subSample = subSamples[i];