[radeon-alex:amd-staging-4.9 4/30] drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:587:2: warning: ISO C90 forbids mixed declarations and code

[kbuild test robot]

tree:   git://people.freedesktop.org/~agd5f/linux.git amd-staging-4.9
head:   efa90756f6e447a7e4133b271e10597078fb58fc
commit: b70d2c05b8b81f09a84d49215ab505ff2c0bd404 [4/30] drm/amd/display: Output Transfer Function Regamma Refactor
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout b70d2c05b8b81f09a84d49215ab505ff2c0bd404
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c: In function 'dce110_translate_regamma_to_hw_format':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:587:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     struct gamma_curve *arr_curve_points = regamma_params->arr_curve_points;
     ^~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:685:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     struct pwl_result_data *rgb = rgb_resulted;
     ^~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:587:22: warning: unused variable 'arr_curve_points' [-Wunused-variable]
     struct gamma_curve *arr_curve_points = regamma_params->arr_curve_points;
                         ^~~~~~~~~~~~~~~~

vim +587 drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c

   571				return false;
   572			}
   573	
   574			++rgb;
   575			++i;
   576		}
   577	
   578		return true;
   579	}
   580	
   581	static bool dce110_translate_regamma_to_hw_format(const struct dc_transfer_func
   582			*output_tf, struct pwl_params *regamma_params)
   583	{
   584		if (output_tf == NULL || regamma_params == NULL)
   585			return false;
   586	
 > 587		struct gamma_curve *arr_curve_points = regamma_params->arr_curve_points;
   588		struct curve_points *arr_points = regamma_params->arr_points;
   589		struct pwl_result_data *rgb_resulted = regamma_params->rgb_resulted;
   590		struct fixed31_32 y_r;
   591		struct fixed31_32 y_g;
   592		struct fixed31_32 y_b;
   593		struct fixed31_32 y1_min;
   594		struct fixed31_32 y3_max;
   595	

---
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