dmr/amdgpu: Fix compile error with CONFIG_DRM_AMDGPU_GART_DEBUGFS

Double defintion of 'i'
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -312,7 +312,7 @@ int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
 		     uint64_t flags)
 {
 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
-	unsigned i,t,p;
+	unsigned t,p;
 #endif
 	int r, i;