crshow: fix potential fd leak

when pb_read_one_eof faild, we should close fd
Signed-off-by: Libo Chen <libo.chen@huawei.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-show.c

@@ -514,8 +514,10 @@ static int cr_show_pid(struct cr_options *opts, int pid)
 		PstreeEntry *pe;
 
 		ret = pb_read_one_eof(fd, &pe, PB_PSTREE);
-		if (ret <= 0)
+		if (ret <= 0){
+			close(fd);
 			return ret;
+		}
 
 		if (pe->pid == pid) {
 			pstree_item_from_pb(pe, &item);