"error: ‘t.data.character.ptr’ may be used uninitialized " when building hubbub with gcc 11

Hi, I found from GNU Guix's build check that when building with gcc 11,

building hubbub would fail when building tests with errors like

COMPILE: test/tokeniser2.c
COMPILE: test/tokeniser3.c
COMPILE: test/tree.c
COMPILE: test/tree2.c
COMPILE: test/tree-buf.c
test/tokeniser2.c: In function 'token_handler':
test/tokeniser2.c:444:46: error: 't.data.character.ptr' may be used
uninitialized [-Werror=maybe-uninitialized]
444 | t.data.character.ptr += len;
| ^~
test/tokeniser2.c:441:38: note: 't' declared here
441 | hubbub_token t;
| ^
test/tokeniser2.c:445:46: error: 't.data.character.len' may be used
uninitialized [-Werror=maybe-uninitialized]
445 | t.data.character.len -= len;
| ^~

...

I briefly took a look of the test source code in question and the
hubbub_token structs seem not explicitly initialized. Is this a real
warning from gcc of possibly uninitialized variable which can cause
the build to fail if allow warnings are treated as errors by gcc
during build (a common practice)? Thanks if maintainer can take a
look.

relevant bug entry and complete bug logs:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63526
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