Fix off-by-one error in PKCS#1 v1.5 encryption padding size.

Change-Id: I0fdfe3223b351d4a064e5dac0aa5d732fa0ab073
diff --git a/android_keymaster_test.cpp b/android_keymaster_test.cpp
index e3faefa..5534a3c 100644
--- a/android_keymaster_test.cpp
+++ b/android_keymaster_test.cpp
@@ -1379,7 +1379,7 @@
 TEST_F(EncryptionOperationsTest, RsaPkcs1TooLarge) {
     ASSERT_EQ(KM_ERROR_OK, GenerateKey(AuthorizationSetBuilder().RsaEncryptionKey(512, 3).Padding(
                                KM_PAD_RSA_PKCS1_1_5_ENCRYPT)));
-    string message = "12345678901234567890123456789012345678901234567890123";
+    string message = "123456789012345678901234567890123456789012345678901234";
     string result;
     size_t input_consumed;