ACPI: SBS: Fix present test in acpi_battery_read()

ACPI: SBS: Fix present test in acpi_battery_read()

The battery->present variable is a 1 bit bitfield in a u8.  This means
that the "state & (1 << battery->id)" test will only work when
"battery->id" is zero, otherwise ->present is zero.  Fix this by adding
a !!.

Fixes: db1c291af7ad ("ACPI: SBS: Make SBS reads table-driven.")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/aQSzr4NynN2mpEvG@stanley.mountain
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>