drm/via/via_dma: Remove set but unused variable 'agp_base'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/via/via_dma.c: In function ‘via_cmdbuf_jump’:
 drivers/gpu/drm/via/via_dma.c:596:11: warning: variable ‘agp_base’ set but not used [-Wunused-but-set-variable]

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201112190039.2785914-5-lee.jones@linaro.org

drivers/gpu/drm/via/via_dma.c

@@ -593,13 +593,11 @@ static inline void via_dummy_bitblt(drm_via_private_t *dev_priv)
 
 static void via_cmdbuf_jump(drm_via_private_t *dev_priv)
 {
-	uint32_t agp_base;
 	uint32_t pause_addr_lo, pause_addr_hi;
 	uint32_t jump_addr_lo, jump_addr_hi;
 	volatile uint32_t *last_pause_ptr;
 	uint32_t dma_low_save1, dma_low_save2;
 
-	agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
 	via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi,
 		      &jump_addr_lo, 0);