getSessionCharacteristic bug fix

close session in the end of for loop

Bug: 337711677
Test: Vendor testing
Change-Id: Ie82622af10079fe7e882cabd4eccdcc1e59a5464
diff --git a/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp b/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
index 368e954..31e8014 100644
--- a/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
+++ b/camera/provider/aidl/vts/VtsAidlHalCameraProvider_TargetTest.cpp
@@ -341,6 +341,10 @@
             ret = device->getSessionCharacteristics(config, &session_chars);
             ASSERT_TRUE(ret.isOk());
             verifySessionCharacteristics(session_chars, camera_chars);
+
+            ret = mSession->close();
+            mSession = nullptr;
+            ASSERT_TRUE(ret.isOk());
         }
     } else {
         ALOGI("getSessionCharacteristics: Test skipped.\n");