linux-user: fix file descriptor leaks

Handle variable "fd_orig" going out of scope leaks the handle.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

linux-user/syscall.c

@@ -5167,6 +5167,7 @@ static int open_self_cmdline(void *cpu_env, int fd)
 
         if (word_skipped) {
             if (write(fd, cp_buf, nb_read) != nb_read) {
+                close(fd_orig);
                 return -1;
             }
         }