forsyth: 8l: cleanup of list for sse regs

Reference: /n/atom/patch/applied/8llistsse
Date: Sun Aug 16 04:19:20 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/8l/list.c	Sun Aug 16 04:19:11 2015
+++ /sys/src/cmd/8l/list.c	Sun Aug 16 04:19:12 2015
@@ -29,10 +29,10 @@
 			break;
 		}
 	default:
-		if(isxyreg(p->to.type) && p->to.index != D_NONE)
+		if(isxyreg(p->from.type) && p->from.index != D_NONE)
 			snprint(str, sizeof(str), "(%ld)	V%A	%D,%R,%R",
 				p->line, p->as, &p->from, p->to.index, p->to.type);
-		else if(isxyreg(p->from.type) && p->from.index != D_NONE)
+		else if(isxyreg(p->to.type) && p->to.index != D_NONE)
 			snprint(str, sizeof(str), "(%ld)	V%A	%R,%R,%D",
 				p->line, p->as, p->from.type, p->from.index, &p->to);
 		else