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nlplug-findfs: add warning about skipped netlink messages

--- a/nlplug-findfs/nlplug-findfs.c

+++ b/nlplug-findfs/nlplug-findfs.c

@@ -1396,8 +1396,10 @@

 					continue;

 				err(1, "recvmsg");

 			}

-			if (len < 32 || len >= sizeof(buf))

+			if (len < 32 || len >= sizeof(buf)) {

+				warnx("Skipping message due to size=%zu", len);

 				continue;

+			}

 			total_bytes += len;

 			chdr = CMSG_FIRSTHDR(&hdr);