Header check before asking previous on orphan not needed. Fast sync now properly keeps the syncing flag on.

grin/src/adapters.rs

@@ -401,11 +401,9 @@ impl NetToChainAdapter {
 			Err(chain::Error::Orphan) => {
 				// make sure we did not miss the parent block
 				if !chain.is_orphan(&prev_hash) && !self.currently_syncing.load(Ordering::Relaxed) {
-					if let Err(_) = chain.get_block_header(&prev_hash) {
 					debug!(LOGGER, "adapter: process_block: received an orphan block, checking the parent: {:}", prev_hash);
 					self.request_block_by_hash(prev_hash, &addr)
 				}
-				}
 				true
 			}
 			Err(ref e) if e.is_bad_data() => {