interfaces/opengl: use == to compare, not =

[zyga]

This fixes an invalid udev rule where SUBSYSTEM was incorrectly compared
to the value "drm" using a single equals character, indicating
assignment. This is not what was meant to happen.

Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@canonical.com

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[zyga]

@mvo5 - this is only affecting master, 2.27 is correct.

[jdstrand]

LGTM

[codecov-io]

Codecov Report

Merging #3833 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3833      +/-   ##
==========================================
+ Coverage   75.74%   75.74%   +<.01%     
==========================================
  Files         409      409              
  Lines       35388    35388              
==========================================
+ Hits        26804    26805       +1     
+ Misses       6688     6687       -1     
  Partials     1896     1896

Impacted Files	Coverage Δ
interfaces/builtin/opengl.go	100% <ø> (ø)	⬆️
cmd/snap/cmd_aliases.go	95% <0%> (+1.66%)	⬆️

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