checkasm: hevc_sao: Fix a regression in hevc_sao_edge

check_func() might return NULL, in which case the function is not to be
benched. Introduced in cc679054.
Signed-off-by: Matthias Dressel <code@deadcode.eu>
Signed-off-by: Martin Storsjö <martin@martin.st>

tests/checkasm/hevc_sao.c

@@ -134,8 +134,8 @@ static void check_sao_edge(HEVCDSPContext *h, int bit_depth)
                     if (memcmp(dst0 + j*stride, dst1 + j*stride, w*SIZEOF_PIXEL))
                         fail();
                 }
+                bench_new(dst1, src1 + offset, stride, offset_val, eo, block_size, block_size);
             }
-            bench_new(dst1, src1 + offset, stride, offset_val, eo, block_size, block_size);
         }
     }
 }