Fix CUDA syntax error introduced by clang-format.

test/gpu_common.h

diff --git a/test/gpu_common.h b/test/gpu_common.h
index 03b9e8f..3b4aefc 100644
--- a/test/gpu_common.h
+++ b/test/gpu_common.h
@@ -55,7 +55,7 @@
                                                             typename std::decay<decltype(*d_out)>::type>),
                      dim3(Grids), dim3(Blocks), 0, 0, ker, n, d_in, d_out);
 #else
-  run_on_gpu_meta_kernel<<<Grids, Blocks> > >(ker, n, d_in, d_out);
+  run_on_gpu_meta_kernel<<<Grids, Blocks>>>(ker, n, d_in, d_out);
 #endif
   // Pre-launch errors.
   gpuError_t err = gpuGetLastError();