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sdnvme: correct mode/serial/firmware string lengths

--- a/sys/src/9/port/sdnvme.c

+++ b/sys/src/9/port/sdnvme.c

@@ -354,9 +354,9 @@

 	e = p+l;

 	s = p;

-	p = seprint(p, e, "model\t%.20s\n", (char*)ctlr->ident+24);

-	p = seprint(p, e, "serial\t%.10s\n", (char*)ctlr->ident+4);

-	p = seprint(p, e, "firm\t%.6s\n", (char*)ctlr->ident+64);

+	p = seprint(p, e, "model\t%.40s\n", (char*)ctlr->ident+24);

+	p = seprint(p, e, "serial\t%.20s\n", (char*)ctlr->ident+4);

+	p = seprint(p, e, "firm\t%.8s\n", (char*)ctlr->ident+64);

 	p = seprint(p, e, "geometry %llud %lud\n", u->sectors, u->secsize);

 	return p-s;