target/hppa: Return zero for r0 from load_gpr

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/hppa/translate.c

@@ -307,9 +307,7 @@ static void cond_free(DisasCond *cond)
 static TCGv_i64 load_gpr(DisasContext *ctx, unsigned reg)
 {
     if (reg == 0) {
-        TCGv_i64 t = tcg_temp_new_i64();
-        tcg_gen_movi_i64(t, 0);
-        return t;
+        return ctx->zero;
     } else {
         return cpu_gr[reg];
     }