libswscale/swscale-test: fix some const correctness

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/swscale-test.c

@@ -51,7 +51,7 @@
      (x) == AV_PIX_FMT_RGB32_1 ||         \
      (x) == AV_PIX_FMT_YUVA420P)
 
-static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1,
+static uint64_t getSSD(const uint8_t *src1, const uint8_t *src2, int stride1,
                        int stride2, int w, int h)
 {
     int x, y;
@@ -346,7 +346,7 @@ int main(int argc, char **argv)
     enum AVPixelFormat srcFormat = AV_PIX_FMT_NONE;
     enum AVPixelFormat dstFormat = AV_PIX_FMT_NONE;
     uint8_t *rgb_data   = av_malloc(W * H * 4);
-    uint8_t *rgb_src[4] = { rgb_data, NULL, NULL, NULL };
+    const uint8_t * const rgb_src[4] = { rgb_data, NULL, NULL, NULL };
     int rgb_stride[4]   = { 4 * W, 0, 0, 0 };
     uint8_t *data       = av_malloc(4 * W * H);
     uint8_t *src[4]     = { data, data + W * H, data + W * H * 2, data + W * H * 3 };