target/openrisc: Fix lf.ftoi.s

The specification of this insn is round-to-zero.

Reviewed-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/openrisc/fpu_helper.c

@@ -78,7 +78,7 @@ uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
 
 uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
 {
-    return float32_to_int32(val, &env->fp_status);
+    return float32_to_int32_round_to_zero(val, &env->fp_status);
 }
 
 #define FLOAT_CALC(name)                                                  \