### Description:
FIO still seems to be returning zero and writing a file after bogus arguments have been provided. In my particular case, it's returning zero when I try to write data to a file with the 'sg' engine.
### Environment:
CentOS release 6.4 (Final)
Linux iosr80-0.us.cray.com 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
### FIO version:
fio-2.2.6-15-g3765
### How to reproduce:
Here is output demonstrating what I'm finding.
[moea@iosr80-0 dev-tests]$ ls -l | grep outfile0
[moea@iosr80-0 dev-tests]$ fio --filename outfile0 --rw=readwrite --ioengine=sg --blocksize=8m --size=128m --name=job0
job0: (g=0): rw=rw, bs=8M-8M/8M-8M/8M-8M, ioengine=sg, iodepth=1
fio-2.2.6-15-g3765
Starting 1 process
job0: Laying out IO file(s) (1 file(s) / 128MB)
ioengine sg only works on block devices
Run status group 0 (all jobs):
Disk stats (read/write):
dm-3: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
sda: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%
[moea@iosr80-0 dev-tests]$ echo $?
0
[moea@iosr80-0 dev-tests]$ ls -l outfile0
-rw-r--r--. 1 moea moea 134217728 Mar 26 17:06 outfile0
========================
Andrew Moe
I/O Device Test Engineer
Cray, Inc.
Saint Paul, MN
(phone) 651-605-8870
========================
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