Use the standrad syntax for initiallizing structs to zero

[jeltz]

As far as I understand you need at least one element to write a literal which initializes a struct to all zeros. In these particular cases I do not think it matters since static variables are always zero initialized but I prefer being clear.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.51%. Comparing base (8084e6a) to head (38fd9ca).
Report is 1 commits behind head on TDE_REL_17_STABLE.

❌ Your project status has failed because the head coverage (85.51%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                 @@
##           TDE_REL_17_STABLE     #411   +/-   ##
==================================================
  Coverage              85.51%   85.51%           
==================================================
  Files                     22       22           
  Lines                   2547     2547           
  Branches                 389      389           
==================================================
  Hits                    2178     2178           
  Misses                   293      293           
  Partials                  76       76           

Components	Coverage Δ
access	83.73% <ø> (ø)
catalog	88.88% <ø> (ø)
common	91.80% <ø> (ø)
encryption	72.56% <ø> (ø)
keyring	72.94% <100.00%> (ø)
src	91.42% <ø> (ø)
smgr	94.88% <ø> (ø)
transam	∅ <ø> (∅)

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[AndersAstrand]

Looks good apart from the spelling of "standard" and "initializing" in the commit message.