[Bug 283486] x11/libX11: Failed to build using GCC 13 due to '-Werror=maybe-uninitialized'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283486

            Bug ID: 283486
           Summary: x11/libX11: 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: x11@FreeBSD.org
          Reporter: msl0000023508@gmail.com
          Assignee: x11@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)
 Attachment #256036 text/plain
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Created attachment 256036
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=256036&action=edit
x11/libX11/files/patch-src-Font.c

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

../include/X11/Xlibint.h:680:34: error: 'nbytes' may be used uninitialized
[-Werror=maybe-uninitialized]
  680 | #define _XRead16(dpy, data, len) _XRead((dpy), (char *)(data), (len))
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Font.c:283:9: note: in expansion of macro '_XRead16'
  283 |         _XRead16 (dpy, (char *)fs->per_char, nbytes);
      |         ^~~~~~~~
Font.c:190:19: note: 'nbytes' was declared here
  190 |     unsigned long nbytes;
      |                   ^~~~~~

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