[TEST] Fix test_mxfp failures from 8de17d2

Signed-off-by: Whitney Tsang <[email protected]>

Author: whitneywhtsang

python/test/unit/language/test_matmul.py

@@ -375,6 +375,8 @@ def test_mxfp(M, N, K, BLOCK_M, BLOCK_N, BLOCK_K, NUM_STAGES, nonKDim, NUM_WARPS
     atol = 0.0001
     rtol = 0.0001
     torch.testing.assert_close(ref_out, output, atol=atol, rtol=rtol)
+    if not is_cuda():
+        return
 
     # Pipelining of dot_scaled requires tmem_copy to be used, which in turn
     # requires the scales to be in the blocked layout in global memory.