drm/amdgpu: fix overflowed constant warning in mmhub_set_clockgating()

To fix potential overflowed constant warning, modify the variables to u32
for getting the return value of RREG32_SOC15().
Signed-off-by: Bob Zhou <bob.zhou@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v1_7.c

@@ -544,7 +544,7 @@ static int mmhub_v1_7_set_clockgating(struct amdgpu_device *adev,
 
 static void mmhub_v1_7_get_clockgating(struct amdgpu_device *adev, u64 *flags)
 {
-	int data, data1;
+	u32 data, data1;
 
 	if (amdgpu_sriov_vf(adev))
 		*flags = 0;

drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c

@@ -671,7 +671,7 @@ static int mmhub_v2_0_set_clockgating(struct amdgpu_device *adev,
 
 static void mmhub_v2_0_get_clockgating(struct amdgpu_device *adev, u64 *flags)
 {
-	int data, data1;
+	u32 data, data1;
 
 	if (amdgpu_sriov_vf(adev))
 		*flags = 0;

drivers/gpu/drm/amd/amdgpu/mmhub_v3_3.c

@@ -613,7 +613,7 @@ static int mmhub_v3_3_set_clockgating(struct amdgpu_device *adev,
 
 static void mmhub_v3_3_get_clockgating(struct amdgpu_device *adev, u64 *flags)
 {
-	int data;
+	u32 data;
 
 	if (amdgpu_sriov_vf(adev))
 		*flags = 0;

drivers/gpu/drm/amd/amdgpu/mmhub_v9_4.c

@@ -657,7 +657,7 @@ static int mmhub_v9_4_set_clockgating(struct amdgpu_device *adev,
 
 static void mmhub_v9_4_get_clockgating(struct amdgpu_device *adev, u64 *flags)
 {
-	int data, data1;
+	u32 data, data1;
 
 	if (amdgpu_sriov_vf(adev))
 		*flags = 0;