staging: bcm2708_vchiq: fix return value check in vchiq_platform_conn_state_changed()

In case of error, the function kthread_create() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

···
 				&vchiq_keepalive_thread_func,
 				(void *)state,
 				threadname);
-			if (arm_state->ka_thread == NULL) {
+			if (IS_ERR(arm_state->ka_thread)) {
 				vchiq_log_error(vchiq_susp_log_level,
 					"vchiq: FATAL: couldn't create thread %s",
 					threadname);