i965: Fix strerror error code sign
authorMark Janes <mark.a.janes@intel.com>
Thu, 19 May 2016 20:42:16 +0000 (13:42 -0700)
committerMark Janes <mark.a.janes@intel.com>
Fri, 20 May 2016 12:58:18 +0000 (05:58 -0700)
commita2d28ddc016af5e819f4b8648a64893b331095b2
treecdcb3491803e0d7d6f92b97836990083adc56c0f
parenteb384daae896970e8164cdc60015b8c48c12f851
i965: Fix strerror error code sign

This trivial fix to error-handling corrects the sign of drm error
codes before passing them to strerror.

Identified by Coverity: CID1358581
src/mesa/drivers/dri/i965/intel_screen.c