Use length of arrays directly in conv

[jishnub]

This may save an unnecessary call to prod

[codecov-commenter]

Codecov Report

Base: 96.83% // Head: 93.25% // Decreases project coverage by -3.58% ⚠️

Coverage data is based on head (ba0586f) compared to base (e449411).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #494      +/-   ##
==========================================
- Coverage   96.83%   93.25%   -3.59%     
==========================================
  Files          16       16              
  Lines        3095     1867    -1228     
==========================================
- Hits         2997     1741    -1256     
- Misses         98      126      +28     

Impacted Files	Coverage Δ
src/dspbase.jl	86.87% <100.00%> (-10.78%)	⬇️
src/diric.jl	81.25% <0.00%> (-18.75%)	⬇️
src/util.jl	85.71% <0.00%> (-8.66%)	⬇️
src/periodograms.jl	89.92% <0.00%> (-8.11%)	⬇️
src/Filters/coefficients.jl	93.22% <0.00%> (-6.78%)	⬇️
src/unwrap.jl	90.44% <0.00%> (-5.11%)	⬇️
src/windows.jl	83.15% <0.00%> (-4.75%)	⬇️
src/Filters/stream_filt.jl	92.97% <0.00%> (-4.15%)	⬇️
src/Filters/filt.jl	96.80% <0.00%> (-2.80%)	⬇️
... and 7 more

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