Convert tail-recursion to loop to avoid stack exhaustion

[kevinbackhouse]

This fixes an OSS-Fuzz issue: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=56746

This call to decodeBlocks is a tail-recursion, so it can be converted to a loop:

exiv2/src/riffvideo.cpp

Lines 466 to 468 in 1697417

	if (!io_->eof() && io_->tell() < io_->size()) {
	decodeBlocks();
	}

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[codecov]

Codecov Report

Merging #2543 (5136c3c) into main (1697417) will decrease coverage by 0.63%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #2543      +/-   ##
==========================================
- Coverage   64.59%   63.97%   -0.63%     
==========================================
  Files         103      103              
  Lines       22224    22468     +244     
  Branches    10857    10856       -1     
==========================================
+ Hits        14356    14374      +18     
- Misses       5633     5873     +240     
+ Partials     2235     2221      -14     

Impacted Files	Coverage Δ
src/riffvideo.cpp	62.43% <80.00%> (-2.72%)	⬇️

... and 57 files with indirect coverage changes

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