fix castException with byte[]

[samalloing]

Hi @carlwilson
In the Viewer there is a CastException in the Byte[] in some WAVE files

This fixes #926

Sam

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.29%. Comparing base (d9cd0c0) to head (bdb3665).
Report is 53 commits behind head on integration.

Additional details and impacted files

@@                Coverage Diff                @@
##             integration     #965      +/-   ##
=================================================
+ Coverage          47.04%   47.29%   +0.25%     
- Complexity          1103     1111       +8     
=================================================
  Files                 57       57              
  Lines               9087     8990      -97     
  Branches            1625     1622       -3     
=================================================
- Hits                4275     4252      -23     
+ Misses              4280     4211      -69     
+ Partials             532      527       -5     

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[carlwilson]

I see the problem and that looks a straightforward fix. Thanks @samalloing