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nusb/kb: simplify repeat logic as scancode now contains the info about esc1 extension

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -597,9 +597,7 @@

 			l = recvul(repeatc);

 			continue;

 		}

-		sc = l;

-		if((l>>8) != 0)

-			sc |= 0x80;

+		sc = l & 0xff;

 		t = Kbdelay;

 		if(alt(a) == 1){

 			t = Kbrepeat;

@@ -622,13 +620,7 @@

 static void

 startrepeat(KDev *f, uchar sc)

 {

-	ulong c;

-

-	if(isext(sc))

-		c = SCesc1 << 8 | (sc & 0xff);

-	else

-		c = sc;

-	sendul(f->repeatc, c);

+	sendul(f->repeatc, sc);

 }

 /*