Handle properly looping over filenames with whitespace

[quapka]

Using -exec would be another option, maybe slightly simpler.

[codecov[bot]]

Codecov Report

Merging #148 (e6e5f37) into develop (9014fe9) will decrease coverage by 0.00%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #148      +/-   ##
===========================================
- Coverage    88.58%   88.58%   -0.01%     
===========================================
  Files           32       32              
  Lines         3619     3618       -1     
  Branches       691      690       -1     
===========================================
- Hits          3206     3205       -1     
  Misses         228      228              
  Partials       185      185              

Impacted Files	Coverage Δ
lib/crypt-pbkdf1-sha1.c	95.29% <0.00%> (-0.06%)	:arrow_down:

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[besser82]

LGTM!