GPIO library doesn't free GPIO file descriptor. File descriptor leak.

[Red-Eyed]

Hello, I found such issue.
I got example of LED and run it.
LED are blink for about minute and that's all.
I run strace and found such error:

select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = 1023
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = -1 EMFILE (Too many open files)
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr1/brightness", O_WRONLY) = -1 EMFILE (Too many open files)
open("/sys/class/leds/beaglebone:green:mmc0/brightness", O_WRONLY) = -1 EMFILE (Too many open files)

• Platform/operating system (i.e. Raspberry Pi with Raspbian operating system,
  Windows 32-bit, Windows 64-bit, Mac OSX 64-bit, etc.):

platform.platform()
'Linux-3.8.13-bone79-armv7l-with-debian-7.11'
platform.linux_distribution()
('debian', '7.11', '')

• Python version (run python -version or python3 -version):

platform.python_version()
'2.7.3'

• Error message you are receiving, including any Python exception traces:
  Library doesn't emit any messages. I did strace.
  Here strace logs:

root@beaglebone:/home/debian# strace -f python programs/beaglebone-test.py
...
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr2/brightness", O_WRONLY) = 9
open("/sys/class/leds/beaglebone:green:usr2/brightness", O_WRONLY) = 10
write(10, "1", 1)                       = 1
close(10)                               = 0
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr3/brightness", O_WRONLY) = 10
open("/sys/class/leds/beaglebone:green:usr3/brightness", O_WRONLY) = 11
write(11, "1", 1)                       = 1
close(11)                               = 0
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = 11
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = 12
write(12, "0", 1)                       = 1
close(12)                               = 0
...
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr2/brightness", O_WRONLY) = 1021
open("/sys/class/leds/beaglebone:green:usr2/brightness", O_WRONLY) = 1022
write(1022, "0", 1)                     = 1
close(1022)                             = 0
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr3/brightness", O_WRONLY) = 1022
open("/sys/class/leds/beaglebone:green:usr3/brightness", O_WRONLY) = 1023
write(1023, "0", 1)                     = 1
close(1023)                             = 0
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = 1023
open("/sys/class/leds/beaglebone:green:usr0/brightness", O_WRONLY) = -1 EMFILE (Too many open files)
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
open("/sys/class/leds/beaglebone:green:usr1/brightness", O_WRONLY) = -1 EMFILE (Too many open files)
open("/sys/class/leds/beaglebone:green:mmc0/brightness", O_WRONLY) = -1 EMFILE (Too many open files)
select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
...
and so on

• List the steps to reproduce the problem below (if possible attach code or commands
  to run):
  On BeagleBone with debian 7 run as root the "On-Board LEDs" example with sleep(0.1) and
  wait several minutes. Then you will see that LEDs stop blinking, and program doesn't emit any error.
  To get error logs:
  Code:

# beaglebone-test.py
import Adafruit_BBIO.GPIO as GPIO
import time

if __name__=="__main__":
    for i in range(4):
        GPIO.setup("USR%d" % i, GPIO.OUT)

    while True:
        for i in range(4):
            GPIO.output("USR%d" % i, GPIO.HIGH)
            time.sleep(0.1)
        for i in range(4):
            GPIO.output("USR%d" % i, GPIO.LOW)
            time.sleep(0.1)

Run script:
strace -f python programs/beaglebone-test.py

[pdp7]

resolved by #146. thanks @Vadim-Stupakov