Silence compiler warnings on clang 21

Clang 21 shows some new compiler warnings, for example:

warning: variable 'dstsize' is uninitialized when passed as a const pointer 
argument here [-Wuninitialized-const-pointer]

The fix is to initialize the variables when they are defined.  This is
similar to, for example, the existing situation in gistKeyIsEQ().

Discussion: 
https://www.postgresql.org/message-id/flat/6604ad6e-5934-43ac-8590-15113d6ae4b1%40eisentraut.org

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/14bb47567a3977cd838f62c4297c2cc4c878e800

Modified Files
--------------
src/backend/access/common/toast_internals.c | 2 +-
src/backend/access/gist/gistutil.c          | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)

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