Don't prefetch on multi-device systems

[vchuravy]

Implements the idea in #2618

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diff --git a/src/compiler/execution.jl b/src/compiler/execution.jl
index ca690d31c..5103fc9dc 100644
--- a/src/compiler/execution.jl
+++ b/src/compiler/execution.jl
@@ -151,8 +151,8 @@ function Adapt.adapt_storage(::KernelAdaptor, xs::DenseCuArray{T,N}) where {T,N}
     can_prefetch &= !__pinned(convert(Ptr{T}, mem), mem.ctx)
     ## pageable memory needs to be accessible concurrently
     can_prefetch &= attribute(device(), DEVICE_ATTRIBUTE_CONCURRENT_MANAGED_ACCESS) == 1
-    ## don't prefetch on multi device systems.
-    can_prefetch &= ndevices() == 1
+        ## don't prefetch on multi device systems.
+        can_prefetch &= ndevices() == 1
 
     if can_prefetch
         # TODO: `view` on buffers?