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NULL-terminate expr lists properly.

--- a/8/isel.c

+++ b/8/isel.c

@@ -75,7 +75,7 @@

 /* used to decide which operator is appropriate

  * for implementing various conditional operators */

 struct {

-    AsmOp test; 

+    AsmOp test;

     AsmOp jmp;

     AsmOp getflag;

 } reloptab[Numops] = {

--- a/8/reduce.c

+++ b/8/reduce.c

@@ -309,7 +309,7 @@

         die("Can't index type %s\n", tystr(n->expr.type));

     u = rval(s, args[1]);

     sz = size(n);

-    v = mkexpr(-1, Omul, u, mkexpr(-1, Olit, mkint(-1, sz), NULL));

+    v = mkexpr(-1, Omul, u, mkexpr(-1, Olit, mkint(-1, sz), NULL), NULL);

     r = mkexpr(-1, Oadd, t, v, NULL);

     return r;

 }

@@ -329,7 +329,7 @@

     }

     /* safe: all types have a sub[0] that we want to grab */

     sz = tysize(n->expr.type->sub[0]);

-    v = mkexpr(-1, Omul, u, mkexpr(-1, Olit, mkint(-1, sz), NULL));

+    v = mkexpr(-1, Omul, u, mkexpr(-1, Olit, mkint(-1, sz), NULL), NULL);

     return mkexpr(-1, Oadd, u, v, NULL);

 }