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dhcpd: ignore ";" filename from sgi arcs bootp(); command

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

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

@@ -932,6 +932,10 @@

 	} else

 		slowdelay(rp);

+	/* ignore file for sgi arcs command bootp(); */

+	if(strcmp(bp->file, ";") == 0)

+		*bp->file = 0;

+

 	/* ignore if we don't know what file to load */

 	if(*bp->file == 0){

 		if(rp->genrequest && *iip->bootf2) /* if not plan 9 & have alternate file... */