tests/checkasm/vf_blend: Update function type

Forgotten in 5b8faaad6c71bbb90951ca1642391e11cf6f5f91,
a69a0b689c3c4e1e0bbf4c17716a25e14332a250.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/checkasm/vf_blend.c

@@ -68,7 +68,7 @@
                      const uint8_t *bottom, ptrdiff_t bottom_linesize,                     \
                      uint8_t *dst, ptrdiff_t dst_linesize,                                 \
                      ptrdiff_t width, ptrdiff_t height,                                    \
-                     struct FilterParams *param, double *values);                          \
+                     struct FilterParams *param, struct SliceParams *sliceparam);          \
         w = WIDTH / depth;                                                                 \
                                                                                            \
         for (i = 0; i < BUF_UNITS - 1; i++) {                                              \