restorer: Drop unneded last_pid_buf

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

include/restorer.h

@@ -65,9 +65,6 @@ struct task_restore_core_args {
 	int				pid;			/* task pid */
 	int				fd_core;		/* opened core file */
 	int				fd_self_vmas;		/* opened file with running VMAs to unmap */
-	union {
-		char			last_pid_buf[PATH_MAX];	/* internal buffer to save stack space  */
-	};
 	char				ns_last_pid_path[PATH_MAX];
 	bool				restore_threads;	/* if to restore threads */
 	u32				rst_lock;

restorer.c

@@ -468,6 +468,7 @@ self_len_end:
 			}
 
 			for (i = 0; i < args->nr_threads; i++) {
+				char last_pid_buf[16];
 
 				/* skip self */
 				if (thread_args[i].pid == args->pid)
@@ -479,12 +480,12 @@ self_len_end:
 					RESTORE_ALIGN_STACK((long)thread_args[i].mem_zone.stack,
 							    sizeof(thread_args[i].mem_zone.stack));
 
-				last_pid_len = vprint_num(args->last_pid_buf, thread_args[i].pid - 1);
-				ret = sys_write(fd, args->last_pid_buf, last_pid_len - 1);
+				last_pid_len = vprint_num(last_pid_buf, thread_args[i].pid - 1);
+				ret = sys_write(fd, last_pid_buf, last_pid_len - 1);
 				if (ret < 0) {
 					write_num_n(__LINE__);
 					write_num_n(ret);
-					write_string_n(args->last_pid_buf);
+					write_string_n(last_pid_buf);
 					goto core_restore_end;
 				}