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9boot: handle automatic length for 64-bit values in hexfmt() for framebuffer address (thanks Michael Forney)

--- a/sys/src/boot/efi/sub.c

+++ b/sys/src/boot/efi/sub.c

@@ -306,8 +306,8 @@

 char*

 hexfmt(char *s, int i, uvlong a)

 {

-	if(i > 8){

-		s = numfmt(s, 16, i-8, a>>32);

+	if(i > 8 || i == 0 && (a>>32) != 0){

+		s = numfmt(s, 16, i ? i-8 : 0, a>>32);

 		i = 8;

 	}

 	return numfmt(s, 16, i, a);