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warning: 'xxx' may be used uninitialized in this function [-Wmaybe-uninitialized]

I just noticed these in the Fedora build log of gnome-shell 3.35.92:

In file included from /usr/lib64/glib-2.0/include/glibconfig.h:9,
                 from /usr/include/glib-2.0/glib/gtypes.h:32,
                 from /usr/include/glib-2.0/glib/galloca.h:32,
                 from /usr/include/glib-2.0/glib.h:30,
                 from /usr/include/glib-2.0/glib/gi18n.h:21,
                 from ../subprojects/extensions-tool/src/command-create.c:21:
../subprojects/extensions-tool/src/command-create.c: In function 'handle_create':
/usr/include/glib-2.0/glib/gmacros.h:1068:89: warning: 'templates' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1068 |   static G_GNUC_UNUSED inline void _GLIB_AUTO_FUNC_NAME(TypeName) (TypeName *_ptr) { if (*_ptr != none) (func) (*_ptr); }     \
      |                                                                                         ^
../subprojects/extensions-tool/src/command-create.c:92:18: note: 'templates' was declared here
   92 |   g_auto (GStrv) templates;

In file included from /usr/lib64/glib-2.0/include/glibconfig.h:9,
                 from /usr/include/glib-2.0/glib/gtypes.h:32,
                 from /usr/include/glib-2.0/glib/galloca.h:32,
                 from /usr/include/glib-2.0/glib.h:30,
                 from /usr/include/glib-2.0/glib/gi18n-lib.h:21,
                 from ../src/shell-app.c:7:
../src/shell-app.c: In function 'shell_app_launch':
/usr/include/glib-2.0/glib/gmacros.h:1045:10: warning: 'gpu' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1045 |     { if (_ptr) (cleanup) ((ParentName *) _ptr); }                                                              \
      |          ^
../src/shell-app.c:1298:27: note: 'gpu' was declared here
 1298 |       g_autoptr(GVariant) gpu;
      |                           ^~~