target/riscv: Fix froundnx.h nanbox check

helper_froundnx_h function mistakenly uses single percision nanbox
check instead of the half percision one. This patch fixes the issue.

Signed-off-by: Branislav Brzak <brzakbranislav@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240608214546.226963-1-brzakbranislav@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/fpu_helper.c

@@ -676,7 +676,7 @@ uint64_t helper_fround_h(CPURISCVState *env, uint64_t rs1)
 
 uint64_t helper_froundnx_h(CPURISCVState *env, uint64_t rs1)
 {
-    float16 frs1 = check_nanbox_s(env, rs1);
+    float16 frs1 = check_nanbox_h(env, rs1);
     frs1 = float16_round_to_int(frs1, &env->fp_status);
     return nanbox_h(env, frs1);
 }