#307 The test of pfbutton driver has some errors

[liushujuan]

The test of pfbutton driver results garbled.Just look at the following below.
root:/> event_test /dev/input/event0
Input driver version is 1.0.1 Input device name: "gpio-keys" F
Supported events:bus 0x19 vendor 0x1 product 0x1 version 0x1�{ 
Event type 0 (Sync) {
Event type 1 (Key) F
Event code 256 (Btn0) 
Event code 257 (Btn1) �{
Event code 258 (Btn2) EEvent: time 222307605.264687, -------------- Report Sync ---�{ 
Testing ... (interrupt to exit) � {
Event: time 222307605.264687, type 1 (Key), code 256 (Btn0),�{ �
EEvent: time 222307614.781299, -------------- Report Sync ---�{
�
Event: time 222307614.781299, type 1 (Key), code 257 (Btn1),�{

If I reboot it,then it will show like this.
root:/> event_test /dev/input/event0
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x1�{�Input device name: "gpio-keys"
Supported events:
Event type 0 (Sync)
Event type 1 (Key)
Event code 256 (Btn0)
Event code 257 (Btn1)
Event code 258 (Btn2)
Testing ... (interrupt to exit)
Event: time 222307668.037514, type 1 (Key), code 256 (Btn0),�{�ᨪ�EEvent: time 222307668.037514, -------------- Report Sync ---�{�d
Event: time 222307674.737459, type 1 (Key), code 256 (Btn0),�{�ᨪ�EEvent: time 222307674.737459, -------------- Report Sync ---�{�F
Event: time 222307679.231726, type 1 (Key), code 257 (Btn1),�{�ᨪ�EEvent: time 222307679.231726, -------------- Report Sync ---�{�F
Event: time 222307680.788461, type 1 (Key), code 257 (Btn1),�{�ᨪ�EEvent: time 222307680.788461, -------------- Report Sync ---�{�F