lint 수정

server/util/LiteHashDRBG.ts

@@ -196,7 +196,7 @@ export class LiteHashDRBG implements RNG {
         if (nextBlockWait) {
             nextBlockWait();
         }
-        return nextBlock!;
+        return nextBlock as Uint8Array;
     }
 
     public async nextBits(bits: number, baseBytes?: number): Promise<Uint8Array> {