Assert the errors size to 1 for case SetDisplayBrightness

null pointer dereference crash will be triggered if vector errors
is emptry when accessing errors[0].errorCode, so change EXPECT_EQ
to ASSERT_EQ to avoid this issue.

Test: run vts -m VtsHalGraphicsComposer3_TargetTest

Signed-off-by: Liu, Kai1 <kai1.liu@intel.com>
(cherry picked from https://android-review.googlesource.com/q/commit:aec33e9a41e4bccfd1834e1ab03f785eea4f0b52)
Merged-In: I3b30d491ef886b98e462447e6de78828e7822fca
Change-Id: I3b30d491ef886b98e462447e6de78828e7822fca
diff --git a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
index f72cf55..012aa3f 100644
--- a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -1839,7 +1839,7 @@
         writer.setDisplayBrightness(getPrimaryDisplayId(), /*brightness*/ 0.5f, -1.f);
         execute();
         const auto errors = mReader.takeErrors();
-        EXPECT_EQ(1, errors.size());
+        ASSERT_EQ(1, errors.size());
         EXPECT_EQ(IComposerClient::EX_UNSUPPORTED, errors[0].errorCode);
         GTEST_SUCCEED() << "SetDisplayBrightness is not supported";
         return;