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 <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/sbs.c

···
 		if (result)
 			return result;
 
-		battery->present = state & (1 << battery->id);
+		battery->present = !!(state & (1 << battery->id));
 		if (!battery->present)
 			return 0;