eth/protocols/snap: set abort when storage range hits limit hash

When the storage iterator reaches the requested limit hash, mark the
response as aborted so endpoint Merkle proofs are included for capped
replies.

eth/protocols/snap/handlers.go

@@ -242,6 +242,7 @@ func ServiceGetStorageRangesQuery(chain *core.BlockChain, req *GetStorageRangesP
 			})
 			// If we've exceeded the request threshold, abort
 			if bytes.Compare(hash[:], limit[:]) >= 0 {
+				abort = true
 				break
 			}
 		}