"GPU #0 COMPUTE ERROR"
Hi,

Have compiled XMRig on Ubuntu 16.04.03 LTS. 

Seems to be running ok, however am getting "GPU $0 COMPUTE ERROR" on the console fairly regularly.

```
 * VERSIONS:     XMRig/2.4.4 libuv/1.8.0 CUDA/7.50 gcc/5.4.0
 * CPU:          Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz x64 AES-NI
 * GPU #0:       GeForce GTX 970 @ 1253/3505 MHz 26x39 0x0 arch:52 SMX:13
 * ALGO:         cryptonight, donate=1%
 * POOL #1:      xmr-usa.dwarfpool.com:8005
 * POOL #2:      xmr-eu.dwarfpool.com:8080
 * API PORT:     8080
 * COMMANDS:     hashrate, health, pause, resume
[2018-01-25 19:03:28] use pool xmr-usa.dwarfpool.com:8005 144.217.61.241
[2018-01-25 19:03:28] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:03:52] accepted (1/0) diff 20000 (333 ms)
[2018-01-25 19:04:31] speed 10s/60s/15m 463.0 462.9 n/a H/s max: 463.0 H/s
[2018-01-25 19:04:54] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:05:00] accepted (2/0) diff 20000 (333 ms)
[2018-01-25 19:05:28] GPU #0 COMPUTE ERROR
[2018-01-25 19:05:31] speed 10s/60s/15m 462.7 462.8 n/a H/s max: 463.0 H/s
[2018-01-25 19:05:39] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:06:01] GPU #0 COMPUTE ERROR
[2018-01-25 19:06:13] accepted (3/0) diff 20000 (333 ms)
[2018-01-25 19:06:19] GPU #0 COMPUTE ERROR
[2018-01-25 19:06:31] speed 10s/60s/15m 462.9 462.7 n/a H/s max: 463.0 H/s
[2018-01-25 19:07:11] GPU #0 COMPUTE ERROR
[2018-01-25 19:07:31] speed 10s/60s/15m 462.9 462.7 n/a H/s max: 463.0 H/s
[2018-01-25 19:08:07] accepted (4/0) diff 20000 (333 ms)
[2018-01-25 19:08:15] accepted (5/0) diff 20000 (336 ms)
[2018-01-25 19:08:31] speed 10s/60s/15m 462.9 462.9 n/a H/s max: 463.0 H/s
[2018-01-25 19:08:44] accepted (6/0) diff 20000 (333 ms)
[2018-01-25 19:08:48] GPU #0 COMPUTE ERROR
[2018-01-25 19:09:28] accepted (7/0) diff 20000 (303 ms)
[2018-01-25 19:09:31] speed 10s/60s/15m 462.9 462.8 n/a H/s max: 463.0 H/s
[2018-01-25 19:09:45] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:09:47] accepted (8/0) diff 20000 (333 ms)
[2018-01-25 19:09:54] GPU #0 COMPUTE ERROR
[2018-01-25 19:10:31] speed 10s/60s/15m 462.9 462.8 n/a H/s max: 463.0 H/s
[2018-01-25 19:11:15] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:11:18] [xmr-usa.dwarfpool.com:8005] duplicate job received, reconnect
[2018-01-25 19:11:18] no active pools, stop mining
[2018-01-25 19:11:24] use pool xmr-usa.dwarfpool.com:8005 66.70.234.210
[2018-01-25 19:11:24] new job from xmr-usa.dwarfpool.com:8005 diff 20000
[2018-01-25 19:11:31] speed 10s/60s/15m 463.1 422.4 n/a H/s max: 463.0 H/s
[2018-01-25 19:11:35] accepted (9/0) diff 20000 (335 ms)
```