sycl: Fix im2col (ggml-org#14797)

Author: Rbiessy

ggml/src/ggml-sycl/im2col.cpp

@@ -26,7 +26,7 @@ static void im2col_kernel(const float * x, T * dst, int64_t batch_offset, int64_
 
     // make each work-item deal with more elements since sycl global range can not exceed max int
     for (int64_t i = global_id; i < pelements; i += (work_group_size * item_ct1.get_group_range(2))) {
-        const int64_t ksize = OW * (KH > 1 ? KW : 1);
+        const int64_t ksize = OW * KH;
         const int64_t kx    = i / ksize;
         const int64_t kd    = kx * ksize;
         const int64_t ky    = (i - kd) / OW;