Test correct backend in examples test

[christiangnrd]

Like #593 but targeting main

[codecov]

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #597       +/-   ##
==========================================
- Coverage   47.52%   0.00%   -47.53%     
==========================================
  Files          22      21        -1     
  Lines        1715    1571      -144     
==========================================
- Hits          815       0      -815     
- Misses        900    1571      +671     

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diff --git a/examples/histogram.jl b/examples/histogram.jl
index d688d314..0b649647 100644
--- a/examples/histogram.jl
+++ b/examples/histogram.jl
@@ -63,7 +63,7 @@ end
 
 end
 
-function histogram!(histogram_output, input, groupsize=256)
+function histogram!(histogram_output, input, groupsize = 256)
     backend = get_backend(histogram_output)
     # Need static block size
     kernel! = histogram_kernel!(backend, (groupsize,))

[christiangnrd]

The wrong answers show up here, and locally I get a segfault. Is this an issue with the histogram example not having been updated or is this an issue with the implicit bounds checking?

Probably the same issue alluded to in JuliaGPU/GPUArrays.jl#590 (comment)