forsyth: functions args not checked is a real error

Reference: /n/atom/patch/applied/ccckfnargs
Date: Sun Aug 16 01:26:36 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/cc/com.c	Sun Aug 16 01:26:27 2015
+++ /sys/src/cmd/cc/com.c	Sun Aug 16 01:26:28 2015
@@ -601,10 +601,8 @@
 			goto bad;
 		n->type = l->type->link;
 		if(!debug['B'])
-			if(l->type->down == T || l->type->down->etype == TOLD) {
-				nerrors--;
+			if(l->type->down == T || l->type->down->etype == TOLD)
 				diag(n, "function args not checked: %F", l);
-			}
 		dpcheck(n);
 		break;