[PATCH -next] drm/amdgpu: fix unused-but-set-variable warnings

[Wei Yongjun]

GCC reports the following warnings with W=1:

drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c:190:22: warning:
 variable 'ring' set but not used [-Wunused-but-set-variable]
  190 |  struct amdgpu_ring *ring;
      |                      ^~~~
drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c:162:22: warning:
 variable 'ring' set but not used [-Wunused-but-set-variable]
  162 |  struct amdgpu_ring *ring;
      |                      ^~~~
drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c:383:22: warning:
 variable 'ring' set but not used [-Wunused-but-set-variable]
  383 |  struct amdgpu_ring *ring;
      |                      ^~~~

Those variables are not really used, so remove them
to fix the warnings.

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c | 2 --
 drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c | 2 --
 drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c  | 3 ---
 3 file changed, 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c 
b/drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c
index 938ef4ce5b76..af6f45c3f6fc 100644
--- a/drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c
+++ b/drivers/gpu/drm/amd/amdgpu/jpeg_v2_5.c
@@ -187,14 +187,12 @@ static int jpeg_v2_5_hw_init(void *handle)
 static int jpeg_v2_5_hw_fini(void *handle)
 {
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-       struct amdgpu_ring *ring;
        int i;
 
        for (i = 0; i < adev->jpeg.num_jpeg_inst; ++i) {
                if (adev->jpeg.harvest_config & (1 << i))
                        continue;
 
-               ring = &adev->jpeg.inst[i].ring_dec;
                if (adev->jpeg.cur_state != AMD_PG_STATE_GATE &&
                      RREG32_SOC15(JPEG, i, mmUVD_JRBC_STATUS))
                        jpeg_v2_5_set_powergating_state(adev, 
AMD_PG_STATE_GATE);
diff --git a/drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c 
b/drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c
index 94be35357f7d..b4d53d1a6123 100644
--- a/drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c
@@ -159,9 +159,7 @@ static int jpeg_v3_0_hw_init(void *handle)
 static int jpeg_v3_0_hw_fini(void *handle)
 {
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-       struct amdgpu_ring *ring;
 
-       ring = &adev->jpeg.inst->ring_dec;
        if (adev->jpeg.cur_state != AMD_PG_STATE_GATE &&
              RREG32_SOC15(JPEG, 0, mmUVD_JRBC_STATUS))
                jpeg_v3_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c 
b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
index 946335d0f19c..d60358767d10 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
@@ -380,15 +380,12 @@ static int vcn_v3_0_hw_init(void *handle)
 static int vcn_v3_0_hw_fini(void *handle)
 {
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-       struct amdgpu_ring *ring;
        int i;
 
        for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
                if (adev->vcn.harvest_config & (1 << i))
                        continue;
 
-               ring = &adev->vcn.inst[i].ring_dec;
-
                if (!amdgpu_sriov_vf(adev)) {
                        if ((adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) ||
                                        (adev->vcn.cur_state != 
AMD_PG_STATE_GATE &&