remove additional and useless loop for each relation file when do ptrack_get_pagemapset query

[vegebird]

remove additional and useless loop for each relation file when do ptrack_get_pagemapset query reported by #12

[codecov]

Codecov Report

Merging #17 (a34e6c3) into master (6f1a27b) will increase coverage by 1.22%.
The diff coverage is 100.00%.

❗ Current head a34e6c3 differs from pull request most recent head 820380a. Consider uploading reports for the commit 820380a to get more accurate results

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   87.40%   88.63%   +1.22%     
==========================================
  Files           2        2              
  Lines         381      431      +50     
==========================================
+ Hits          333      382      +49     
- Misses         48       49       +1     

Impacted Files	Coverage Δ
ptrack.c	93.10% <100.00%> (+1.60%)	⬆️
engine.c	84.64% <0.00%> (ø)

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[vegebird]

@ololobus Hello Alexey, could you please have a look at this PR ?
In rainy day scenarios, ptrack_get_pagemapset() may return error pagecount/pagemap for the changed relation files when do additional ptrack_map->entries[hash] checker and hash collision happens.

[ololobus]

@funny-falcon @kulaginm have a look, when you'll have a chance, please

[funny-falcon]

Well, I approve.
Please, accept suggestion on condition.