bsd-user: Remove used from TaskState

The 'used' field in TaskState is write only. Remove it from TaskState.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>

bsd-user/main.c

@@ -210,7 +210,6 @@ void init_task_state(TaskState *ts)
 {
     int i;
 
-    ts->used = 1;
     ts->first_free = ts->sigqueue_table;
     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];

bsd-user/qemu.h

@@ -92,7 +92,6 @@ typedef struct TaskState {
 
     struct TaskState *next;
     struct bsd_binprm *bprm;
-    int used; /* non zero if used */
     struct image_info *info;
 
     struct emulated_sigtable sigtab[TARGET_NSIG];