[Patch] GCN: Silence unused-variable warning

[Tobias Burnus]

Probably added for symmetry with out_mode/out_n but at the end not used.
That function was added in commit
   r13-6423-gce9cd7258d0 amdgcn: Enable SIMD vectorization of math functions

Tested the removal by building with that patch applied.
OK for mainline?

Tobias
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