target/rx: Use target_ulong for address in LI

Using int32_t meant that the address was sign-extended to uint64_t
when passing to translator_ld*, triggering an assert.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2453
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Thomas Huth <thuth@redhat.com>

target/rx/translate.c

@@ -85,7 +85,8 @@ static uint32_t decode_load_bytes(DisasContext *ctx, uint32_t insn,
 
 static uint32_t li(DisasContext *ctx, int sz)
 {
-    int32_t tmp, addr;
+    target_ulong addr;
+    uint32_t tmp;
     CPURXState *env = ctx->env;
     addr = ctx->base.pc_next;