crypto: fix getter of a QCryptoSecret's property

This fixes the condition-check done by the "loaded" property
getter, such that the property returns true even when the
secret is loaded by the 'file' option.

Signed-off-by: Tong Ho <tong.ho@xilinx.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

crypto/secret.c

@@ -221,6 +221,7 @@ qcrypto_secret_prop_set_loaded(Object *obj,
         secret->rawlen = inputlen;
     } else {
         g_free(secret->rawdata);
+        secret->rawdata = NULL;
         secret->rawlen = 0;
     }
 }
@@ -231,7 +232,7 @@ qcrypto_secret_prop_get_loaded(Object *obj,
                                Error **errp G_GNUC_UNUSED)
 {
     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
-    return secret->data != NULL;
+    return secret->rawdata != NULL;
 }