Make sure that read is complete to prevent infinite loop (backport #1788)

[mergify]

This is an automatic backport of pull request #1788 done by Mergify.

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[codecov]

Codecov Report

Merging #1797 (9004fb5) into main (7251a96) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1797      +/-   ##
==========================================
+ Coverage   67.58%   67.63%   +0.05%     
==========================================
  Files         151      151              
  Lines       20903    20902       -1     
==========================================
+ Hits        14127    14137      +10     
+ Misses       6776     6765      -11     

Impacted Files	Coverage Δ
src/jpgimage.cpp	78.24% <100.00%> (+0.52%)	⬆️
src/actions.cpp	74.38% <0.00%> (+0.34%)	⬆️
src/exiv2.cpp	66.36% <0.00%> (+0.34%)	⬆️

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