i965: drop an unused parameter of a function

Signed-off-by: Andrii Simiklit <andrii.simiklit@globallogic.com>
10 jobs for !1175 with snb_nohiz_fix in 12 minutes and 31 seconds (queued for 1 second)
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passed #384370
debian

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meson-clang

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meson-clover

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meson-main

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meson-swr-glvnd

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meson-vulkan

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scons-llvm

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scons-nollvm

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scons-swr

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scons-win64

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