[CBRD-24168] Fixed the problem that the critical section is not returned when an error occurs after entering it in function logpb_copy_page.

[keonwoo98]

http://jira.cubrid.org/projects/CBRD/issues/CBRD-24168

Purpose
In the logpb_copy_page(), if the thread has entered critical section as reader and the current index in the log buffer is invalid, it should exit critical section since it's error.

Implementation
Inserted an escape condition to exit critical section on error.

Remarks
N/A

[codecov-commenter]

Codecov Report

Merging #3333 (5961658) into develop (489c314) will increase coverage by 45.67%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##           develop    #3333       +/-   ##
============================================
+ Coverage     0.00%   45.67%   +45.67%     
============================================
  Files          469      500       +31     
  Lines       360689   396866    +36177     
============================================
+ Hits             0   181262   +181262     
+ Misses      360689   215604   -145085     

Impacted Files	Coverage Δ
src/transaction/log_page_buffer.c	35.30% <0.00%> (+35.30%)	⬆️
src/loaddb/load_db.c	0.00% <0.00%> (ø)
src/broker/broker_recv_fd.c	0.00% <0.00%> (ø)
src/loaddb/load_error_handler.cpp	0.00% <0.00%> (ø)
src/xasl/xasl_unpack_info.hpp
src/compat/dbtype.h
src/heaplayers/utility/align.h
src/storage/external_sort.c	47.44% <0.00%> (ø)
src/executables/javasp.cpp	47.03% <0.00%> (ø)
src/storage/overflow_file.c	62.05% <0.00%> (ø)
... and 371 more

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[eido5]

Thank you for your first contribution.

[joohok]

LGTM :)