drm/amdgpu: Fix uninitialized variable in gfx_v9_4_3_cp_resume

drm/amdgpu: Fix uninitialized variable in gfx_v9_4_3_cp_resume

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:1925:6: error: variable 'r' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        if (amdgpu_xcp_query_partition_mode(adev->xcp_mgr,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:1931:6: note: uninitialized use occurs here
        if (r)
            ^
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:1925:2: note: remove the 'if' if its condition is always true
        if (amdgpu_xcp_query_partition_mode(adev->xcp_mgr,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c:1923:7: note: initialize the variable 'r' to silence this warning
        int r, i, num_xcc;
             ^
              = 0
1 error generated.

Suggested-by: Lijo Lazar <lijo.lazar@amd.com>
Cc: Luben Tuikov <luben.tuikov@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>