drm/nouveau/bo: Remove unused function

Remove the function nouveau_bo_rd16() that is not used anywhere.

This was partially found by using a static code analysis program
called cppcheck.
Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -533,20 +533,6 @@ _nouveau_bo_mem_index(struct nouveau_bo *nvbo, unsigned index, void *mem, u8 sz)
 }
 #define nouveau_bo_mem_index(o, i, m) _nouveau_bo_mem_index(o, i, m, sizeof(*m))
 
-u16
-nouveau_bo_rd16(struct nouveau_bo *nvbo, unsigned index)
-{
-	bool is_iomem;
-	u16 *mem = ttm_kmap_obj_virtual(&nvbo->kmap, &is_iomem);
-
-	mem = nouveau_bo_mem_index(nvbo, index, mem);
-
-	if (is_iomem)
-		return ioread16_native((void __force __iomem *)mem);
-	else
-		return *mem;
-}
-
 void
 nouveau_bo_wr16(struct nouveau_bo *nvbo, unsigned index, u16 val)
 {

drivers/gpu/drm/nouveau/nouveau_bo.h

@@ -78,7 +78,6 @@ int  nouveau_bo_unpin(struct nouveau_bo *);
 int  nouveau_bo_map(struct nouveau_bo *);
 void nouveau_bo_unmap(struct nouveau_bo *);
 void nouveau_bo_placement_set(struct nouveau_bo *, u32 type, u32 busy);
-u16  nouveau_bo_rd16(struct nouveau_bo *, unsigned index);
 void nouveau_bo_wr16(struct nouveau_bo *, unsigned index, u16 val);
 u32  nouveau_bo_rd32(struct nouveau_bo *, unsigned index);
 void nouveau_bo_wr32(struct nouveau_bo *, unsigned index, u32 val);