selftests/cpu-hotplug: exit with failure when test occured unexpected behaviors

Previously, 'make run_tests -C cpu-hotplug' always PASS since cpu-on-off-test.sh
always exits 0 even though the test got some unexpected errors like below:
root@debian9:/home/lizhijian/chroot/linux/tools/testing/selftests/cpu-hotplug# make run_tests
pid 878's current affinity mask: 1
pid 878's new affinity mask: 1
CPU online/offline summary:
Cpus in online state: 0
        Cpus in offline state: 0
Limited scope test: one hotplug cpu
        (leaves cpu in the original state):
        online to offline to online: cpu 0
./cpu-on-off-test.sh: line 83: /sys/devices/system/cpu/cpu0/online: Permission denied
offline_cpu_expect_success 0: unexpected fail
./cpu-on-off-test.sh: line 78: /sys/devices/system/cpu/cpu0/online: Permission denied
online_cpu_expect_success 0: unexpected fail
selftests: cpu-on-off-test.sh [PASS]

after this patch, the test will exit with failure once it occurs some unexpected behaviors
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh

@@ -89,8 +89,10 @@ online_cpu_expect_success()
 
 	if ! online_cpu $cpu; then
 		echo $FUNCNAME $cpu: unexpected fail >&2
+		exit 1
 	elif ! cpu_is_online $cpu; then
 		echo $FUNCNAME $cpu: unexpected offline >&2
+		exit 1
 	fi
 }
 
@@ -100,8 +102,10 @@ online_cpu_expect_fail()
 
 	if online_cpu $cpu 2> /dev/null; then
 		echo $FUNCNAME $cpu: unexpected success >&2
+		exit 1
 	elif ! cpu_is_offline $cpu; then
 		echo $FUNCNAME $cpu: unexpected online >&2
+		exit 1
 	fi
 }
 
@@ -111,8 +115,10 @@ offline_cpu_expect_success()
 
 	if ! offline_cpu $cpu; then
 		echo $FUNCNAME $cpu: unexpected fail >&2
+		exit 1
 	elif ! cpu_is_offline $cpu; then
 		echo $FUNCNAME $cpu: unexpected offline >&2
+		exit 1
 	fi
 }
 
@@ -122,8 +128,10 @@ offline_cpu_expect_fail()
 
 	if offline_cpu $cpu 2> /dev/null; then
 		echo $FUNCNAME $cpu: unexpected success >&2
+		exit 1
 	elif ! cpu_is_online $cpu; then
 		echo $FUNCNAME $cpu: unexpected offline >&2
+		exit 1
 	fi
 }