dmr/amdgpu: Fix compile error with CONFIG_DRM_AMDGPU_GART_DEBUGFS

Double defintion of 'i'

Signed-off-by: Andrey Grodzovsky <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 		     uint64_t flags)
 {
 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
-	unsigned i,t,p;
+	unsigned t,p;
 #endif
 	int r, i;