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devfs-posix: add missing stat() call in fsattach to fill info for root fid

--- a/kern/devfs-posix.c

+++ b/kern/devfs-posix.c

@@ -55,6 +55,9 @@

 	static int devno;

 	Ufsinfo *uif;

+	if(stat("/", &stbuf) < 0)

+		error(strerror(errno));

+

 	c = devattach('U', spec);

 	uif = mallocz(sizeof(Ufsinfo), 1);