usb-device: Fix mismatch add/remove object
The node added and remove does not match which would result in the
entries not being removed properly. Also fixed nullptr access for char*
which can cause sdbus property error.
Tested:
```
$ USB device removed with dev node: /dev/bus/usb/001/114
USB device removed with dev node: /dev/bus/usb/001/117
USB device removed with dev node: /dev/bus/usb/001/116
USB device removed with dev node: /dev/bus/usb/001/115
USB device removed with dev node: /dev/bus/usb/001/113
USB device removed with dev node: /dev/bus/usb/001/110
USB device removed with dev node: /dev/bus/usb/001/104
USB device removed with dev node: /dev/bus/usb/001/106
USB device removed with dev node: /dev/bus/usb/001/107
USB device removed with dev node: /dev/bus/usb/001/108
USB device removed with dev node: /dev/bus/usb/001/109
USB device removed with dev node: /dev/bus/usb/001/105
$ Adding /xyz/openbmc_project/devices/_2f1_2d1_2e5 -> /dev/bus/usb/001/005
Adding /xyz/openbmc_project/devices/_2f1_2d1_2e6 -> /dev/bus/usb/001/006
Adding /xyz/openbmc_project/devices/_2f1_2d1_2e6_2e1 -> /dev/bus/usb/001/007
Adding /xyz/openbmc_project/devices/_2f1_2d1_2e6_2e2 -> /dev/bus/usb/001/008
Adding /xyz/openbmc_project/devices/_2f1_2d1_2e6_2e3 -> /dev/bus/usb/001/009
Adding /xyz/openbmc_project/devices/_2f1_2d1_2e6_2e4 -> /dev/bus/usb/001/010
```
Removing and adding usb devices without the daemon crashing.
Google-Bug-Id: 311478549
Change-Id: I55e6befba51fda72d4343db906c07f0f29d951d3
Signed-off-by: Willy Tu <wltu@google.com>
(cherry picked from commit 5f15f30a4d98a0f08b35115e7858c816f8927fa8)
1 file changed
