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tftpd: apply sstallion's tftpd-rfc patch (from sources)

tftpd option handling is not RFC-compliant. This causes picky
clients (such as curl) to fail transfers.

--- a/sys/src/cmd/ip/tftpd.c

+++ b/sys/src/cmd/ip/tftpd.c

@@ -342,9 +342,6 @@

 	if (bp + 3 >= ep)

 		return -1;

-	*bp++ = '\0';

-	*bp++ = '\0';			/* overkill */

-	*bp++ = '\0';

 	if (write(fd, buf, bp - buf) < bp - buf) {

 		syslog(dbg, flog, "tftpd network write error on oack to %s: %r",

-- 

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