bug#25559: Trouble getting battery status

[Rahul Martim Juliato <rahuljuliato@gmail.com>]

Hello!

battery.el gives me an error, where is not possible to find my battery
info directory. 

I'm on a 32 bit ARM, Arch Linux with 3.8.11 kernel, Samsung Chromebook,
and on the proc directoy this is what I have:

~ $ ls -l /sys/class/power_supply/
total 0
lrwxrwxrwx   1 root           root     0 2017-01-27 21:48 sbs-104-000b -> ../../devices/12ca0000.i2c/i2c-4/i2c-104/104-000b/power_supply/sbs-104-000b
lrwxrwxrwx   1 root           root     0 2017-01-27 21:47 tps65090-ac -> ../../devices/12ca0000.i2c/i2c-4/i2c-104/104-0048/tps65090-charger/power_supply/tps65090-ac
~ $ 

That means, I have 2 sub-directories, and battery info is inside
sbs-104-000b.

Taking a look into battery.el, it seems that the program does not tests
for inner directories possibility.

It would be nice for this to look for it, or at least give me possibility to
point the exactly location in a variable.

Thanks,

Rahul