tpm2_getmanufec: only attempt to persist the EK if a handle was provided

The tool has a -H option to provide a persistent handle to store a EK, but
currently is trying to do it even if no handle was provided.

Make it fail early if that's the case since there's no point in attempting
an operation that will fail.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

tools/tpm2_getmanufec.c

@@ -235,6 +235,12 @@ int createEKHandle(TSS2_SYS_CONTEXT *sapi_context)
     LOG_INFO("EK create succ.. Handle: 0x%8.8x", handle2048ek);
 
     if (!ctx.non_persistent_read) {
+
+        if (!ctx.persistent_handle) {
+            LOG_ERR("Persistent handle for EK was not provided");
+            return 1;
+        }
+
          /*
           * To make EK persistent, use own auth
           */