video: rockchip: rga2: fix clang warning

drivers/video/rockchip/rga2/rga2_mmu_info.c:284:20: warning: explicitly assigning value of variable of type 'uint32_t' (aka 'unsigned int') to itself [-Wself-assign]
            stride = stride;
            ~~~~~~ ^ ~~~~~~

Change-Id: I1c5d3b2f3354437777c8431ad027a98815f1fe70
Signed-off-by: Tao Huang <huangtao@rock-chips.com>

Author: rkhuangtao

drivers/video/rockchip/rga2/rga2_mmu_info.c

@@ -323,7 +323,6 @@ static int rga2_buf_size_cal(unsigned long yrgb_addr, unsigned long uv_addr, uns
         case RGA2_FORMAT_YCbCr_420_SP_10B:
         case RGA2_FORMAT_YCrCb_420_SP_10B:
             stride = (w + 3) & (~3);
-            stride = stride;
             size_yrgb = stride * h;
             size_uv = (stride * (h >> 1));
             start = MIN(yrgb_addr, uv_addr);