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devfs-posix: error on rename when newpath already exists

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

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

@@ -429,6 +429,8 @@

 			free(newpath);

 			nexterror();

 		}

+		if(stat(newpath, &stbuf) >= 0)

+			error(Eexist);

 		if(rename(uif->path, newpath) < 0)

 			error(strerror(errno));

 		free(uif->path);