linux-user/elfload: Remove pointless non-const CPUArchState cast

fill_thread_info() takes a pointer to const.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220509205728.51912-2-philippe.mathieu.daude@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/elfload.c

@@ -3973,7 +3973,7 @@ static int fill_note_info(struct elf_note_info *info,
         if (cpu == thread_cpu) {
             continue;
         }
-        fill_thread_info(info, (CPUArchState *)cpu->env_ptr);
+        fill_thread_info(info, cpu->env_ptr);
     }
     cpu_list_unlock();