[Bug 283540] x11/libXext: Failed to build using GCC 13 due to '-Werror=maybe-uninitialized'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283540

            Bug ID: 283540
           Summary: x11/libXext: Failed to build using GCC 13 due to
                    '-Werror=maybe-uninitialized'
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Building with GCC 13.3 (lang/gcc13 13.3.0) fails with:

In function 'StuffToWire',
    inlined from 'XagCreateEmbeddedApplicationGroup' at XAppgroup.c:195:5:
XAppgroup.c:146:18: error: 'stuff.black_pixel' may be used uninitialized
[-Werror=maybe-uninitialized]
  146 |         *value++ = stuff->black_pixel;
      |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
XAppgroup.c: In function 'XagCreateEmbeddedApplicationGroup':
XAppgroup.c:171:21: note: 'stuff.black_pixel' was declared here
  171 |     struct xagstuff stuff;
      |                     ^~~~~
In function 'StuffToWire',
    inlined from 'XagCreateEmbeddedApplicationGroup' at XAppgroup.c:195:5:
XAppgroup.c:149:18: error: 'stuff.white_pixel' may be used uninitialized
[-Werror=maybe-uninitialized]
  149 |         *value++ = stuff->white_pixel;
      |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
XAppgroup.c: In function 'XagCreateEmbeddedApplicationGroup':
XAppgroup.c:171:21: note: 'stuff.white_pixel' was declared here
  171 |     struct xagstuff stuff;
      |                     ^~~~~

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