nxcodec: update log information

Signed-off-by: shizhenghui <[email protected]>

Author: shizhenghui

system/nxcodec/nxcodec.c

@@ -133,7 +133,7 @@ int nxcodec_init(FAR nxcodec_t *codec)
   codec->output.fd = open(codec->output.filename, O_RDONLY);
   if (codec->output.fd < 0)
     {
-      printf("Failed to open input file %s \n", codec->output.filename);
+      printf("Failed to open output file %s \n", codec->output.filename);
       ret = -errno;
       goto err0;
     }

system/nxcodec/nxcodec_context.c

@@ -67,7 +67,9 @@ nxcodec_context_dequeue_buf(FAR nxcodec_context_t *ctx)
   ret = ioctl(codec->fd, VIDIOC_DQBUF, &buf);
   if (ret < 0)
     {
-      printf("type: %d VIDIOC_DQBUF, err: %s\n", ctx->type, strerror(errno));
+      printf("%s: VIDIOC_DQBUF - %s\n",
+        V4L2_TYPE_IS_OUTPUT(ctx->type) ? "output" : "capture",
+        strerror(errno));
       return NULL;
     }