HID: logitech-hidpp: initialize level variable

Static analysis reports this representative problem

hid-logitech-hidpp.c:1356:23: warning: Assigned value is
garbage or undefined
hidpp->battery.level = level;
^ ~~~~~

In some cases, 'level' is never set in hidpp20_battery_map_status_voltage()
Since level is not available on all hw, initialize level to unknown.

Fixes: be281368f297 ("hid-logitech-hidpp: read battery voltage from newer devices")
Signed-off-by: Tom Rix <[e-mail]>
Reviewed-by: Filipe Laíns <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-logitech-hidpp.c

···
 	int status;
 
 	long flags = (long) data[2];
+	*level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
 
 	if (flags & 0x80)
 		switch (flags & 0x07) {