More specific libdrm error message

[Xie, AlexBin]

Hi,


v2: Use strerror instead of %m. %m is a GNU C Library extension.

Thanks,

Alex Bin Xie

________________________________
From: Xie, AlexBin
Sent: Wednesday, January 11, 2017 4:14 PM
To: amd-gfx at lists.freedesktop.org
Subject: More specific libdrm error message

Hi,

Provide more specific error message if non-privileged user runs amdgpu_test

Before this change, the error message is:" WARNING - Suite initialization failed..." People might think this is a driver problem.


Tested with non-privileged user. Now the error message is like.

...
Error:Permission denied. Hint: Try to run this test program as root.
WARNING - Suite initialization failed for 'Basic Tests'.

...



Tested as root with no regression.



Please review.


Thanks,

Alex Bin Xie
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