Keystore 2.0 SPI: Fix NullPointerException in setKeyEntry.

Fix a NullPointerException when trying to insert SecretKey that already
exists.

Bug: 202146009
Test: atest android.keystore.cts.AndroidKeyStoreTest#testKeyStore_SetKeyEntry_ReplacedWithSameGeneratedSecretKey
Change-Id: If3a4bd6677ab3173c5c1a7c921ba567b7981662b
1 file changed