intel/compiler: Fix resource leak in error path

CID: 1452261

Fixes: 04a99515 "intel/compiler: add ability to override shader's assembly"

Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
17 jobs for !1662 with fix/coverity-1452261 in 18 minutes and 10 seconds (queued for 3 seconds)
latest detached
Status Name Job ID Coverage
  Containers Build
passed debian #506826

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  Build+Test
passed meson-arm64 #506835

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passed meson-armhf #506834

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passed meson-clang #506828

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passed meson-clover #506832

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passed meson-i386 #506836

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passed meson-main #506831

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passed meson-swr-glvnd #506827

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passed meson-vulkan #506833

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passed scons-llvm #506838

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passed scons-nollvm #506837

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passed scons-swr #506829

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passed scons-win64 #506830

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  Test
passed test-llvmpipe-gles2 1/4 #506839

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passed test-llvmpipe-gles2 2/4 #506840

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passed test-llvmpipe-gles2 3/4 #506841

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passed test-llvmpipe-gles2 4/4 #506842

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