Fix tr in Julia 1.12

[mtfishman]

Fix tr in Julia 1.12, see #632.

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diff --git a/src/host/linalg.jl b/src/host/linalg.jl
index 8f87186..5ffd032 100644
--- a/src/host/linalg.jl
+++ b/src/host/linalg.jl
@@ -62,7 +62,7 @@ end
 
 function LinearAlgebra.tr(A::AnyGPUMatrix)
     LinearAlgebra.checksquare(A)
-    sum(diag(A))
+    return sum(diag(A))
 end
 
 ## copy upper triangle to lower and vice versa