drm/amd/amdgpu: Fix missing null check in atombios_i2c.c
Reported by smatch: amdgpu_atombios_i2c_process_i2c_ch() error: we previously assumed 'buf' could be null Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NErnst Sjöstrand <ernstp@gmail.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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