parse_hwdb: fix compatibility with pyparsing 2.4.*

parse_hwdb: fix compatibility with pyparsing 2.4.*

pyparsing 2.3.1/2.4.0 had some changes to grouping of And matches, and as a
result we'd report 0 properties and 0 matches, and not really do any checks.

With this change we get identical behaviour for pyparsing 2.3.1, 2.4.0, 2.4.2:

$ hwdb/parse_hwdb.py
hwdb/60-evdev.hwdb: 72 match groups, 94 matches, 262 properties
hwdb/60-input-id.hwdb: 3 match groups, 3 matches, 4 properties
hwdb/60-keyboard.hwdb: 173 match groups, 256 matches, 872 properties
Keycode KBD_LCD_MENU1 unknown
Keycode KBD_LCD_MENU4 unknown
Keycode KBD_LCD_MENU2 unknown
Keycode KBD_LCD_MENU3 unknown
hwdb/60-sensor.hwdb: 101 match groups, 120 matches, 105 properties
hwdb/70-joystick.hwdb: 2 match groups, 3 matches, 2 properties
hwdb/70-mouse.hwdb: 104 match groups, 119 matches, 123 properties
hwdb/70-pointingstick.hwdb: 8 match groups, 30 matches, 11 properties
hwdb/70-touchpad.hwdb: 6 match groups, 9 matches, 6 properties