Fix memory leak in NativeVelocityCipher

native/src/main/java/com/velocitypowered/natives/encryption/NativeVelocityCipher.java

@@ -56,11 +56,16 @@ public class NativeVelocityCipher implements VelocityCipher {
     int len = source.readableBytes();
     ByteBuf out = ctx.alloc().directBuffer(len);
 
+    try {
       impl.process(this.ctx, source.memoryAddress() + source.readerIndex(), len,
           out.memoryAddress(), encrypt);
       source.skipBytes(len);
       out.writerIndex(len);
       return out;
+    } catch (Exception e) {
+      out.release();
+      throw e;
+    }
   }
 
   @Override