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nlplug-findfs: increase socket buffer

Use bigger socket buffer to avoid "No buffer space available" error.

ref https://gitlab.alpinelinux.org/alpine/aports/-/issues/12325#note_244883

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

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

@@ -419,7 +419,7 @@

 	/* kernel will not create events bigger than 16kb, but we need

 	   buffer up all events during coldplug */

-	slen = 512*1024;

+	slen = 1024*1024;

 	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &slen,

 				sizeof(slen)) < 0) {

 		err(1, "setsockopt");