sample-trace-array: Remove trace_array 'sample-instance'

Remove trace_array 'sample-instance' if kthread_run fails
in sample_trace_array_init().

Link: https://lkml.kernel.org/r/[e-mail]

Cc: [e-mail]
Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <[e-mail]>
Signed-off-by: Kefeng Wang <[e-mail]>
Signed-off-by: Steven Rostedt (VMware) <[e-mail]>

samples/ftrace/sample-trace-array.c

···
 	trace_printk_init_buffers();
 
 	simple_tsk = kthread_run(simple_thread, NULL, "sample-instance");
-	if (IS_ERR(simple_tsk))
+	if (IS_ERR(simple_tsk)) {
+		trace_array_put(tr);
+		trace_array_destroy(tr);
 		return -1;
+	}
+
 	return 0;
 }