Camera: Close session after validating flash keys

Bug: 333353956
Test: Tested on a pixel device
Change-Id: Ic48ec93cc579579fa7a39b66d0dc4cf0a7c11531
diff --git a/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp b/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
index 6e3ddc9..368e954 100644
--- a/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
+++ b/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
@@ -177,6 +177,9 @@
             const camera_metadata_t* staticMeta =
                     reinterpret_cast<const camera_metadata_t*>(meta.metadata.data());
             verifyManualFlashStrengthControlCharacteristics(staticMeta);
+            ret = mSession->close();
+            mSession = nullptr;
+            ASSERT_TRUE(ret.isOk());
         }
     } else {
         ALOGI("validateManualFlashStrengthControlKeys: Test skipped.\n");