potential memory leak if no any wal files

[jtao1735]

No description provided.

[codecov-io]

Codecov Report

Merging #1652 into develop will increase coverage by 0.30%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1652      +/-   ##
===========================================
+ Coverage    24.07%   24.38%   +0.30%     
===========================================
  Files           70       70              
  Lines        27248    28013     +765     
===========================================
+ Hits          6560     6830     +270     
- Misses       20688    21183     +495     

Impacted Files	Coverage Δ
src/client/src/tscUtil.c	53.00% <0.00%> (-1.89%)	⬇️
src/client/src/tscSql.c	31.57% <0.00%> (-1.77%)	⬇️
src/client/src/tscServer.c	51.00% <0.00%> (-1.12%)	⬇️
src/util/inc/tutil.h	100.00% <0.00%> (ø)
src/util/src/tcompare.c	0.00% <0.00%> (ø)
src/client/src/tscSubquery.c	8.11% <0.00%> (+2.29%)	⬆️

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